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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	double a,s;
  5. 	scanf("%lf",&a);
  6. 	s=a*a*3.14;
  7. 	printf("%lf",s);
  8. 	return 0;
  9. }
  10.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/EVLwra
language:
C99 (gcc 8.3)
created:
5 days ago
visibility:
public

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