상환 후 남은 돈이 얼마? (knk ch2-8)

#include <stdio.h>

int main(void){

double loan, rate, payment, result,monthly_rate;

printf("Enter amount of loan: ");

scanf("%lf",&loan);

printf("Enter interest rate: ");

scanf("%lf",&rate);

printf("Enter monthly payment: ");

scanf("%lf",&payment);

monthly_rate=rate/12;

result=(double)loan*(1+(monthly_rate/100))-payment;

printf("Balance remaining after first payment: %.2lf\n",result);

result=(double)result*(1+(monthly_rate/100))-payment;

printf("Balance remaining after second payment: %.2lf\n",result);

result=(double)result*(1+(monthly_rate/100))-payment;

printf("Balance remaining after third payment: %.2lf\n",result);

return 0;

}