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  1. #include <stdio.h>
  2.  
  3. int i;
  4. int main()
  5. {
  6. 	int ch = 1;
  7. 	double a, area;
  8. switch(ch)
  9. {
  10.     case 1: printf("equilateral triangle \n");
  11.             printf("value of side \n");
  12.             scanf("%lf",&a);
  13.            // printf("\n %f", a);
  14.             area= 0.433*a*a;
  15.             printf("\n %lf", area);
  16.             break;
  17.  
  18.     default : break;
  19.  
  20. }
  21. }
  22.  
Success #stdin #stdout 0s 2296KB
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equilateral triangle 
value of side 

 10.825000
https://ideone.com/LG7d7o
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
public

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