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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	// your code goes here
  5.     const double PI=3.14159;
  6.     double r;
  7.     scanf("%lf",&r);
  8.     printf("zhouchang=%f\n",2*PI*r);
  9.     printf("mianji=%f\n",PI*r*r);
  10. 	return 0;
  11. }
  12.  
Success #stdin #stdout 0s 5308KB
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stdin
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zhouchang=18.849540
mianji=28.274310
https://ideone.com/3oyYeH
language:
C (gcc 8.3)
created:
23 hours ago
visibility:
public

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