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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	// your code goes here
  5.     #define PI 3.14159
  6.  
  7.     double r;
  8.     scanf("%lf",&r);
  9.     printf("circumference=%.2f\n",2*PI*r);
  10.     printf("area=%.2f\n",PI*r*r);
  11. 	return 0;
  12. }
  13.  
Success #stdin #stdout 0s 5288KB
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circumference=12.57
area=12.57
https://ideone.com/Jmqh3p
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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