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  1. #include <stdio.h>
  2. #include <math.h>
  3. struct length{
  4. 	double a;
  5. 	double b;
  6. 	double c;
  7. };
  8. int main(void) {
  9.  
  10. 	struct length tri = {3, 4, 5};
  11.  
  12. 	double p = tri.a+tri.b+tri.c;
  13. 	double q = p/2;
  14.  
  15. 	double r = q-tri.a;
  16. 	double s = q-tri.b;
  17. 	double t = q-tri.c;
  18. 	double u = q*r*s*t;
  19.  
  20. 	printf("a : %lf \nb : %lf \nc : %lf\n三角形の面積 : %lf",tri.a,tri.b,tri.c,sqrt(u));
  21.  
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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a : 3.000000 
b : 4.000000 
c : 5.000000
三角形の面積 : 6.000000
https://ideone.com/yfwtRD
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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