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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	double a;
  5. 	scanf("%lf",&a);
  6. 	printf("%lf\n",3.14*a*a);
  7. 	return 0;
  8. }
  9.  
Success #stdin #stdout 0s 5280KB
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50.240000
https://ideone.com/aAopgS
language:
C (gcc 8.3)
created:
139 days ago
visibility:
public

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