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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct {
  5.     double a;
  6.     double b;
  7.     double c;
  8. } Triangle;
  9.  
  10. int main(void) {
  11.     Triangle t;
  12.     double s,area;
  13.  
  14.     printf("aを入力");
  15.     scanf("%lf",&t.a);
  16.  
  17.     printf("bを入力");
  18.     scanf("%lf",&t.b);
  19.  
  20.     printf("cを入力");
  21.     scanf("%lf",&t.c);
  22.  
  23.     s = (t.a+t.b+t.c)/2.0;
  24.     area = sqrt(s*(s -t.a)*(s-t.b)*(s-t.c));
  25.  
  26.     printf("3辺の長さが%lf,%lf,%lfの三角形の面積は %lf\n",
  27.            t.a,t.b,t.c,area);
  28.  
  29.     return 0;
  30. }
Success #stdin #stdout 0.01s 5320KB
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stdout
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aを入力bを入力cを入力3辺の長さが3.000000,4.000000,5.000000の三角形の面積は 6.000000
https://ideone.com/SRbVZC
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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