principal = 10000, interest rate = 5% , 10000 → 20000 when will it double?

Question

#include <stdio.h>

int main()
{
    int x=5;  //x = interest rate(5%)
    int y=10000; //y = principal

    int n = 0;   //n = after years
    while (1)
    {
        n++;
        y += y*(x/100);
        if(y == 20000)
            break;

    }

    printf("%d years later, double.",n);

    return 0;
}

When I run it, nothing happens.

Description Resource Path Location Type cannot open output file mm.exe: Permission denied mm C/C++ Problem

I would appreciate it if you let me know what went wrong.

Description Resource Path Location Type cannot open output file mm.exe: Permission denied money C/C++ Problem — jinj, May 22 '18 at 12:12
I'm not sure what that has to do with anything, but looking over your code, `y == 20000` is unlikely to be true. Try changing it to `y >= 20000`. — Carcigenicate, May 22 '18 at 12:13

score 0 · Answer 1 · answered May 22 '18 at 12:21

Since you have X as an integer and it's value is 5, at

y+= y*(x/100)

Is equivalent to

y+= 0

as (5/100) with integer division yields 0. This results in while(1) looping infinitely, and thus will never allow the program to terminate.

Additionally, the permission denied error looks like it can be fixed by changing your save file location. Here is my source and some extra info

Hope this helps!

principal = 10000, interest rate = 5% , 10000 → 20000 when will it double?

1 Answers1