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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct data {
  5.     double a; 
  6.     double b;
  7.     double c; 
  8. };
  9.  
  10. int main() {
  11.     struct data n;
  12.     scanf("%lf", &n.a);
  13.     scanf("%lf", &n.b);
  14.     scanf("%lf", &n.c);
  15.     printf("a=%lf,b=%lf,c=%lf\n",n.a,n.b,n.c);
  16.  
  17.     double s = (n.a + n.b + n.c) / 2.0;
  18.     double K = sqrt(s * (s - n.a) * (s - n.b) * (s - n.c));
  19.     printf("面積は %lf\n", K);
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5276KB
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stdin
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5
5
5
stdout
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a=5.000000,b=5.000000,c=5.000000
面積は 10.825318
https://ideone.com/FXiBGy
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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