单、复利计算程序

#include<stdio.h>
#include<math.h>
void view()
{
printf("              |---------------------------------------------|\n");
printf("              |                 单/复利计算                 |\n");
printf("              |---------------------------------------------|\n");
printf("              |1.单利计算                                   |\n");
printf("              |---------------------------------------------|\n");
printf("              |2.复利计算                                   |\n");
printf("              |---------------------------------------------|\n");
printf("              |0.退出系统                                   |\n");
printf("              |---------------------------------------------|\n");
}

main()
{
int i,n,m;
double v,money;  //本金
int years;    //存钱年数
double sum;  //存款总额
double r;   //利率
while(1)
{
view();
printf("请选择(0-2):");
scanf("%d",&n);
switch(n)
{
case 1:
printf("请输入本金:");
scanf("%lf",&money);
printf("请输入存钱年数:");
scanf("%d",&years);
printf("请输入利率:");
scanf("%lf",&r);
for(i = 1 ; i<=years; i++)
{
sum = r*i*money+money;
printf("存入第%d年后的存款总额为:%.2lf\n",i,sum);
}
printf("\n\n\n");
break;
case 2:
printf("请选择:\n");
printf("1.通过本金求存款总额\n");
printf("2.通过目标总额求本金\n\n");
scanf("%d",&m);
switch(m)
{
case 1:
printf("请输入本金:");
scanf("%lf",&money);
printf("请输入存钱年数:");
scanf("%d",&years);
printf("请输入利率:");
scanf("%lf",&r);
for(i = 1 ; i<=years; i++)
{
v=pow(1+r,i);
sum = v*money;
printf("存入第%d年后的存款总额为:%.2lf\n",i,sum);
}
printf("\n\n\n");
break;
case 2:
printf("请输入目标金钱:");
scanf("%lf",&sum);
printf("请输入存钱年数:");
scanf("%d",&years);
printf("请输入利率:");
scanf("%lf",&r);
for(i = 1 ; i<=years; i++)
{
v=pow(1+r,i);
}
money=sum/v;
printf("现在必须存入本金为:%.2lf\n",money);
printf("\n\n\n");
break;
}
case 0:
return 0;
}
}
}