[[練習問題]] // 連立方程式を自動で作成し、そのまま自動で解くプログラム #include <stdio.h> #include <stdlib.h> #include <time.h> void main() { double a[6]; double x1, x2, x; double y1, y2, y; double z1, z2; int i; srand(time(NULL)); while (1) { for (i = 0; i < 6; i++) { a[i] = (rand() % 40) + 1; if (a[i] > 20) a[i] -= 41; } x1 = a[0]; y1 = a[1]; z1 = a[2]; x2 = a[3]; y2 = a[4]; z2 = a[5]; x1 = a[0]; y1 = a[1]; z1 = a[2]; x2 = a[3]; y2 = a[4]; z2 = a[5]; printf("\n%3dx + %3dy = %3d", (int)x1, (int)y1, (int)z1); printf("\n%3dx + %3dy = %3d", (int)x2, (int)y2, (int)z2); x = (z1 - (y1/y2)*z2)/(x1 - (y1/y2)*x2); y = (z1 - (x1*x)) / y1; printf("\n\nx = %6.3f y = %6.3f キー入力(0で終了) --- ", x, y); scanf("%d", &i); if (i == 0) break; } }