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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. struct area{
  5. 	double a;
  6. 	double b;
  7. 	double c;
  8. };
  9.  
  10. int main(void) {
  11. 	struct area triangle={5,5,5};
  12. 	double p=(triangle.a+triangle.b+triangle.c)/2;
  13. 	double s=p*(p-triangle.a)*(p-triangle.b)*(p-triangle.c);
  14. 	printf("a:%lf\nb:%lf\nc:%lf\n三角形の面積:%lf\n",triangle.a,triangle.b,triangle.c,sqrt(s));
  15. 	return 0;
  16. }
  17.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
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/O2TSKk
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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