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  1. #include <stdio.h>
  2. #define PI 3.14159
  3. int main(void) {
  4. 	// your code goes here
  5.     double r;
  6.     printf("Input r:");
  7.     scanf("%lf",&r);
  8.     printf("周长=%f\n",2*PI*r);
  9.     printf("area=%f\n",PI*r*r);
  10. 	return 0;
  11. }
  12.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Input r:周长=0.000000
area=0.000000
https://ideone.com/8hlvSy
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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