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@@ -0,0 +1,270 @@
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+#include <stdio.h>
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+#include <string.h>
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+#include <math.h>
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+
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+void calculateSquareEquation(float a, float b, float c, float* x1, float* x2) {
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+ float D;
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+ D = b * b - 4 * a * c;
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+ if (a == 0) {
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+ *x1 = -c / b;
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+ }
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+ else if (D > 0) {
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+ *x1 = (-b + sqrt(D)) / (2 * a);
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+ *x2 = (-b - sqrt(D)) / (2 * a);
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+ }
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+ else if (D == 0) {
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+ *x1 = -b / (2 * a);
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+ }
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+}
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+
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+void SLU(float a, float b, float c, float a1, float b1, float c1, float* x1, float* x2) {
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+
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+ float d;
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+ d = a * b1 - a1 * b;
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+ if (d)
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+ {
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+ *x1 = (c * b1 - c1 * b) / d;
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+ *x2 = (a * c1 - a1 * c) / d;
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+ }
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+
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+}
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+
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+void inputData(int a,int* f, float* a1, float* b1, float* c1, float* a2, float* b2, float* c2)
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+{
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+ char buf[100];
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+ switch (a) {
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+ case 1:
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+ for (;;)
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+ {
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+ printf("Ââåäèòå a: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", a1, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå b: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", b1, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå c: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", c1, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ break;
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+ case 2:
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+ for (;;)
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+ {
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+ printf("Ââåäèòå a1: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", a1, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå b1: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", b1, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå c1: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", c1, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå a2: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", a2, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå b2: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", b2, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ for (;;)
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+ {
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+ printf("Ââåäèòå c2: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%f %n", c2, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå 1 ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ break;
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+ case 3:
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+ for (;;)
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+ {
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+ printf("Ââåäèòå a: ");
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%d %n", f, &n) == 1 && buf[n] == '\0')
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå öåëîå ÷èñëî. Ïîïðîáóé åùå ðàç\n", buf);
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+ }
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+ break;
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+ }
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+}
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+
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+void GetData(int a,int f, float x1, float x2)
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+{
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+ switch (a) {
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+ case 1:
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+ if (x1 != 0 && x2 != 0)
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+ {
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+ printf("Êîðíè óðàâíåíèÿ x1 = %f x2 = %f", x1,x2);
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+ }
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+ else if(x1 != 0)
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+ {
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+ printf("Êîðåíü óðàâíåíèÿ x = %f", x1);
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+ }
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+ else
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+ {
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+ printf("Êîðíåé íåò");
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+ }
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+ break;
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+ case 2:
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+ if (x1 == 0 && x2 == 0)
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+ {
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+ printf("Ñóùåñòâóåò áåñêîíå÷íîå ìíîæåñòâî ðåøåíèé");
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+ }
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+ else
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+ {
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+ printf("X ðàâåí %f Y ðàâåí %f", x1, x2);
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+ }
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+ break;
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+ case 3:
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+ printf("Ôàêòîðèàëà ðàâåí %d", f);
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+ break;
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+ }
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+}
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+
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+void Factorial(int* f)
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+{
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+ int x, xF, d;
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+ xF = *f;
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+ x = xF;
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+ for (d = 1;d < x;d++)
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+ {
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+ xF = xF * (x - d);
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+ }
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+ *f = xF;
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+}
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+
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+void main()
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+{
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+ system("chcp 1251");
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+ float a1, b1, c1, a2, b2, c2, x1 = 0, x2 = 0;
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+ int a,f = 0;
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+ char buf[100];
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+ printf("Âûáåðåòå íîìåð çàäàíèÿ: \n");
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+ printf("1. Êâàäðàòíîå óðàâíåíèå. \n");
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+ printf("2. Ñèñòåìà äâóõ ëèíåéíûõ óðàâíåíèé. \n");
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+ printf("3. Ïåðåñòàíîâêè (ôàêòîðèàë). \n");
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+ for (;;)
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+ {
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+ if (fgets(buf, sizeof buf, stdin) == NULL) {
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+ printf("Input closed\n");
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+ break;
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+ }
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+ int n;
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+ if (sscanf_s(buf, "%d %n", &a, &n) == 1 && buf[n] == '\0' && a >= 1 && a <=3)
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+ {
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+ break;
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+ }
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+ printf("<%s> ýòî íå íîìåð çàäàíèÿ. Ïîïðîáóé åùå ðàç.\n", buf);
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+ }
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+ switch (a) {
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+ case 1:
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+ inputData(a,&f, &a1, &b1, &c1, &a2, &b2, &c2);
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+ calculateSquareEquation(a1, b1, c1, &x1, &x2);
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+ GetData(a,f, x1, x2);
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+ break;
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+ case 2:
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+ inputData(a, &f, &a1, &b1, &c1, &a2, &b2, &c2);
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+ SLU(a1, b1, c1, a2, b2, c2, &x1, &x2);
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+ GetData(a, f, x1, x2);
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+ break;
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+ case 3:
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+ inputData(a, &f, &a1, &b1, &c1, &a2, &b2, &c2);
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+ Factorial(&f);
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+ GetData(a,f, x1, x2);
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+ break;
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+ }
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+}
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