E=mc2(header stdio.h)

#include <stdio.h>

int main()
{
    float c,m,E;
    c = 89.88;
        printf("Masukkan Nilai Massa (Kg) : ");
        scanf("%f",&m);
        E = m * c * c;
        printf("E = %f J\n" ,E);
    return 0;
}