example

#include<cstdio>
using namespace std;
int main()
{
    while(1)
    {

        int deposit;
        printf("Deposit:");
        scanf("%d",&deposit);
        if(deposit==0)
            break;

        printf("===========Type Deposit===========\n");
        printf("1->Two year interest 4.10'\n");
        printf("2->three year interest 4.15\n");
        printf("3->Four year interest 4.20\n");
        printf("4->Five year interest 4.30\n");
        printf("==================================\n");

        int Choose;
        printf("Choose<1-4>:");
        scanf("%d",&Choose);

        float ib;
        if(Choose==1)
            ib=(float)deposit*1.083681;
        else if(Choose==2)
            ib=(float)deposit*1.129738;
        else if(Choose==3)
            ib=(float)deposit*1.178883;
        else if(Choose==4)
            ib=(float)deposit*1.234302;
        printf("%d  ---> %.2f\n",deposit,ib);
    }

    return 0;
}