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  1. #include<stdio.h>
  2. const double PI=3.141592;
  3. double area_circle(double r)
  4. { return r*r*PI; }
  5. int main(void)
  6. { double r;
  7. scanf("%lf",&r);
  8. printf("面積:%lf",area_circle(r));
  9. return 0; }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
7
stdout 
面積:153.938008
https://ideone.com/OGiAbN
language:
C (gcc 8.3)
created:
128 days ago
visibility:
public

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