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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main() {
  5.     double a, b, c, x1, x2;
  6.     printf("请输入一元二次方程的系数 a, b, c：\n");
  7.     scanf("%lf%lf%lf", &a, &b, &c);
  8.  
  9.     double delta = b * b - 4 * a * c;
  10.  
  11.     if (delta > 0) {
  12.         x1 = (-b + sqrt(delta)) / (2 * a);
  13.         x2 = (-b - sqrt(delta)) / (2 * a);
  14.         printf("方程有两个实数解：\n");
  15.         printf("x1=%.2f\n", x1);
  16.         printf("x2=%.2f\n", x2);
  17.     } else if (delta == 0) {
  18.         x1 = -b / (2 * a);
  19.         printf("方程有一个实数解：\n");
  20.         printf("x1=x2=%.2f\n", x1);
  21.     } else {
  22.         printf("方程无实数解。\n");
  23.     }
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5288KB
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请输入一元二次方程的系数 a, b, c：
方程无实数解。
https://ideone.com/jApvsw
language:
C (gcc 8.3)
created:
7 hours ago
visibility:
public

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