C 复利季刊

Question

我在这段代码中遇到一个问题:输出结果始终与主体具有相同的值。为什么？

#include <math.h>
#include <conio.h>

void main()
{
    float principal, rate, total_amount, interest, i, j;
    int time, year, quarterly, x, y;

    printf("Enter Principal : ");
    scanf("%f", &principal);
    printf("Enter Interest Rate : ");
    scanf("%f", &rate);
    printf("Enter Time : ");
    scanf("%d", &time);

    for(x = 1; x <= time; x++)
    {
        i = rate / 400;
        total_amount = principal * pow(1 + (i), x); //total_amount = total_end
        interest = total_amount - principal;

        printf("%d\t\t %.2f\t\t %.2f\t\t %.2f\n", x, principal, interest, total_amount);
    }

    getch();
}

Answer 1

我不确定我是否正确理解了您的单行问题陈述，但在我看来，您没有更新下一次迭代的主体。

你应该使用

for(x = 1; x <= time; x++)
    {
        i = rate / 400;
        total_amount = principal * pow(1 + (i), x); //total_amount = total_end
        interest = total_amount - principal;

        printf("%d\t\t %.2f\t\t %.2f\t\t %.2f\n", x, principal, interest, total_amount);
        principal =  total_amount ; //see here
    }