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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4.  
  5. int QuadFormula(double a, double b, double c) {
  6.     if (a == 0.0) {
  7.         printf("aが0のため2次方程式ではありません。\n");
  8.         return 0;
  9.     }
  10.  
  11.     double D = b*b - 4.0*a*c;
  12.  
  13.     if (D > 0.0) {
  14.  
  15.         double sqrtD = sqrt(D);
  16.         double x1 = (-b + sqrtD) / (2.0 * a);
  17.         double x2 = (-b - sqrtD) / (2.0 * a);
  18.         printf("解は %f と %f です。\n", x1, x2);
  19.     } else if (D == 0.0) {
  20.  
  21.         double x = -b / (2.0 * a);
  22.         printf("解は %f です。\n", x);
  23.     } else {
  24.  
  25.         double real = -b / (2.0 * a);
  26.         double imag = sqrt(-D) / (2.0 * a);
  27.  
  28.         printf("解は %f+%fi, %f-%fi です。\n", real, imag, real, imag);
  29.     }
  30.  
  31.     return 0;
  32. }
  33.  
  34. int main(void) {
  35.     double a, b, c;
  36.  
  37.     printf("aの値：\n");
  38.     if (scanf("%lf", &a) != 1) { return 1; }
  39.  
  40.     printf("bの値：\n");
  41.     if (scanf("%lf", &b) != 1) { return 1; }
  42.  
  43.     printf("cの値：\n");
  44.     if (scanf("%lf", &c) != 1) { return 1; }
  45.  
  46.     QuadFormula(a, b, c);
  47.  
  48.     return 0;
  49. }
  50.  
Success #stdin #stdout 0s 5320KB
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1
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stdout
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aの値：
bの値：
cの値：
解は 2.000000 と 1.000000 です。
https://ideone.com/a5QwdR
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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