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];
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; }
}
