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  1. int main() {
  2. 	const double PI= 3.14;
  3. 	double s ;
  4. 	double r ;
  5. 	printf("请输入圆的半径:");
  6. 	scanf("%f", &r);
  7. 	s = PI*r*r;
  8.  
  9.     printf("圆的面积为%.2f\n", s);
  10.     return 0;
  11. }
  12.  
  13.  
Success #stdin #stdout 0.01s 5288KB
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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/wpj6DS
language:
C (gcc 8.3)
created:
29 days ago
visibility:
public

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