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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct triangle{
  5. int a,b,c;
  6. };
  7.  
  8. int main(void){
  9. double s;
  10. double area;
  11. struct triangle x={5,5,5};
  12.  
  13. s=(x.a+x.b+x.c)/2.0;
  14. area=sqrt(s*(s-x.a)*(s-x.b)*(s-x.c));
  15.  
  16. printf("a:%d\n",x.a);
  17. printf("b:%d\n",x.b);
  18. printf("c:%d\n",x.c);
  19. printf("三角形の面積: %f\n", area);
  20. return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5288KB
stdin
Standard input is empty
stdout
a:5
b:5
c:5
三角形の面積: 10.825318