printf("剩余本金%.2lf\n", benjin  - benjin / yue_a * i);

printf("剩余本金%.2lf\n", benjin * (1 - 1 / yue_a * i)); /*这不是数学除法*/

 

#include 
     
      #define M 999int main(){        double benjin = 0.0;        double lilv = 0.0;        double nianxian = 0.0;        double benxi_a = 0.0;        double lixi_a = 0.0;        int yue_a = 0;        int i;        float yue_benjin = 0.0;        double lixi[M] = {
   0.0};        printf("请输入本金 年利率 年限\n");        scanf("%lf%lf%lf", &benjin, &lilv, &nianxian);        yue_a = nianxian * 12;        yue_benjin = benjin /yue_a;#ifdef DEBUG        printf("%.2lf\n",yue_benjin);#endif        for (i = 0; i < yue_a; ++i)        {                lixi[i] = (benjin - yue_benjin * i) * lilv /1200;#ifdef DEBUG                printf("%.2lf\n",lixi[i]);#endif                //printf("第%d个月-应还本金%.2lf\t-应还利息%.2lf\t-剩余本金%.2lf\n", i, yue_benjin, lixi[i], benjin * (1 - 1 / yue_a * i));     /*这不是数学 俩个整数除*/                printf("第%d个月-应还本金%.2lf\t-应还利息%.2lf\t-剩余本金%.2lf\n", i, yue_benjin, lixi[i], benjin  - benjin / yue_a * i);                lixi_a += lixi[i];        }        benxi_a = lixi_a + benjin;        printf("总本金[%lf] 总利息[%lf] 总本金利息和[%lf]\n", benjin, lixi_a, benxi_a);        return 0;}