Expression Result Unused Greedy Algorithm

Question

I have run this program and get the error expression result unused. I may be doing something simple wrong, but I have spent the day trying to figure it out to no avail. Any help

Answer 1

All the 4 statements x - 25, x- 10, x- 5, x - 1 will turn out to be useless unless you assign that value to x; Because you are trying to subtract the value from x, but you are not assigning the new value to x.

Here is the solution of your problem:

#include 
#include 

int main()
{
    int x, y = 0;
    printf("Enter the amount of change ");
    x = GetFloat() * 100;
    while (x != 0)
    {
        if (x >= 25)
        {
            x = x - 25;   //or x-=25;
            y = y + 1;
        }


        if (x >= 10 && x < 25)
        {
            x = x - 10;   //or x-=10;
            y = y + 1;
        }
        if (x >= 5 && x < 10)
        {
            x = x - 5;    //or x-=5;
            y = y + 1;
        }
        if (x >= 1 && x < 5)
        {
            x = x - 1;     //or x-=1; or x--; or --x; :)
            y = y + 1;
        }
   }
   printf("The number of coins neccessary is %d", y);
}