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  1. //第5回　課題1
  2.  
  3. #include <stdio.h>
  4. #include <math.h>
  5.  
  6. struct shape{
  7. 	double a;
  8. 	double b;
  9. 	double c;
  10. };
  11.  
  12. int main(void){
  13. 	struct shape tri;
  14.  
  15. 	scanf("%lf %lf %lf",&tri.a,&tri.b,&tri.c);
  16. 	double half=(tri.a+tri.b+tri.c)/2;
  17. 	double s=sqrt(half*(half-tri.a)*(half-tri.b)*(half-tri.c));
  18.  
  19. 	printf("a：%lf\n",tri.a);
  20. 	printf("b：%lf\n",tri.b);
  21. 	printf("c：%lf\n",tri.c);
  22. 	printf("三角形の面積：%lf\n",s);
  23.  
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 5288KB
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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
三角形の面積：10.825318
https://ideone.com/3v76zs
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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