#include<stdio.h>
const double PI=3.141592;
double circum_length(double r)
{ return 2.0*r*PI; }
double area(double r)
{ return PI*r*r; }
int main(void){
double r;
printf("円周の長さ:%lf m\n",circum_length
(r
)); printf("面積: %lf m2\n",area
(r
)); return 0; }
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