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  1. #include <stdio.h>
  2. #define PI 3.14
  3. int main(void) {
  4. 	double a,b,c;
  5. 	scanf("%lf",&a);//半径//
  6. 	b = a*a*PI;
  7. 	c = a*2*PI;
  8. 	printf("面積%lf,円周%lf",b,c);
  9.  
  10. return 0;
  11. }
Success #stdin #stdout 0.01s 5304KB
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面積28.260000,円周18.840000
https://ideone.com/KBnIpo
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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