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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct deta {
  5.     double a; 
  6.     double b;
  7.     double c; 
  8. };
  9.  
  10. int main() {
  11.     struct deta n;
  12.  
  13.     printf("aの長さ = ");
  14.     scanf("%lf", &n.a);
  15.     printf("bの長さ = ");
  16.     scanf("%lf", &n.b);
  17.     printf("cの長さ = ");
  18.     scanf("%lf", &n.c);
  19.     printf("a=%lf,b=%lf,c=%lf\n",n.a,n.b,n.c);
  20.  
  21.     double s = (n.a + n.b + n.c) / 2.0;
  22.     double K = sqrt(s * (s - n.a) * (s - n.b) * (s - n.c));
  23.     printf("面積は %lf\n", K);
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5280KB
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stdin
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5
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5
stdout
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aの長さ = bの長さ = cの長さ = a=5.000000,b=5.000000,c=5.000000
面積は 10.825318
https://ideone.com/qbs4yg
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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