Dairenin Alanı

#include <stdio.h>
main(){

    float pi = 3.14;
    int yaricap;
    float alan;

    printf("Yaricapi giriniz :");
    scanf("%d",&yaricap);

    alan = (float)(pi*yaricap*yaricap);

    printf("%.2f",alan);


    getchar();
}