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  1. #include <stdio.h>
  2.  
  3.  
  4. int main() {
  5. 	const double PI= 3.14;
  6. 	double s ;
  7. 	double r ;
  8. 	printf("请输入圆的半径:");
  9. 	scanf("%lf", &r);
  10. 	s = PI*r*r;
  11.  
  12.     printf("圆的面积为%.2f\n", s);
  13.     return 0;
  14. }
Success #stdin #stdout 0.01s 5276KB
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Standard input is empty
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请输入圆的半径:圆的面积为0.00
https://ideone.com/Lr9tJy
language:
C (gcc 8.3)
created:
29 days ago
visibility:
public

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