课后练习，银行利息c语言

#include <stdio.h>
#include <math.h>

int main()
{
float principal;
float r1=0.0414,r2=0.0468,r3=0.0540,r4=0.0585,r5=0.0072;

scanf("%f",&principal);
printf("本金为%.0f\n",principal);

printf("一次存五年总收入为%f\n",principal*(1+r4*5));
printf("先存两年到期后本息再存三年总收入为%f\n",principal*(1+r2*2)*(1+r3*3));
printf("先存三年到期后本息再存两年总收入为%f\n",principal*(1+r3*3)*(1+r2*2));
printf("存五次一年期总收入为%f\n",principal*pow(1+r1,5));
printf("一次存五年总收入为%f\n",principal*pow(1+r5/4,20));

return 0;
}