請教C語言編程中計算還貸後剩余的貸款金額的詳細答案, 最好能夠說明壹下每個步驟!

int?main(void){

float?amount,rate,payment,month_rate,tmp1,tmp2,tmp3;

printf("Enter?amount?of?lean:");

scanf("%f",&amount);

printf("Enter?interest?rate:");

scanf("%f",&rate);

printf("Enter?monthly?payment:");

scanf("%f",&payment);

month_rate?=?rate?/?100.0f?/?12.0f;

tmp1?=?(amount-payment)+amount*month_rate;

tmp2?=?(tmp1-payment)+tmp1*month_rate;

tmp3?=?(tmp2-payment)+tmp2*month_rate;

printf("Balance?remaining?after?first?payment:%.2f\n",tmp1);

printf("Balance?remaining?after?second?payment:%.2f\n",tmp2);

printf("Balance?remaining?after?third?payment:%.2f\n",tmp3);

}

這是我的答案，我覺得最佳答案對於學習第壹章的朋友並不是很友好。