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  1. #include <stdio.h>
  2. int main()
  3. {
  4. 	double a,x;
  5. 	scanf("%lf",&a);
  6. 	x=a*a*3.14;
  7.  
  8. 	printf("面積は%lfです。\n",x);
  9. 	return 0;
  10. }
Success #stdin #stdout 0s 5316KB
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3.0
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面積は28.260000です。
https://ideone.com/EtMtUM
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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