#include <stdio.h>
int main()
{
int r = 5;
double pi = 3.14;
printf("원주 = %d * 2 * %f = %f \n", r, pi, r * 2 * pi);
printf("넓이 = %d * %d * %f = %f \n", r, r, pi, r * r * pi);
return 0;
}
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