So I am taking cs50 and I am doing the greedy algorithm "cash" problem, and the code I've written compiles fine, but when I run it, it asks for "Change amount in USD:" and then never accepts a valid response and I'm stuck entering inputs forever and nothing happens.
A friend said that I was missing an input and that's why it wasn't working, but I'm trying to use the user's input, so... Your help would be greatly appreciated, because I think I'm really close, I just have not idea how to fix it, and help50 says that technically nothing's wrong, so I'm just at a stand still.
Thank you!
#include <cs50.h>
#include <stdio.h>
#include <math.h>
int main(void)
{
// identifying variables
float amount;
int cents;
int count = 0;
// prompting user for input
do
{
amount = get_float("Change amount in USD: ");
}
// ensuring a positive number
while (amount < 0);
//changing float to an int
cents = round(amount*100);
// using highest denomination first (quarters)
while (cents % 25 >= 0)
{
count++;
cents = cents % 25;
}
// using next highest denomination second (dimes)
while (cents % 10 >= 0)
{
count++;
cents = cents % 10;
}
// using next highest denomination third (nickels)
while (cents % 5 >= 0)
{
count++;
cents = cents % 5;
}
// using last denomination amount (pennies)
while (cents % 1 >= 0)
{
count++;
cents = cents % 1;
}
// displays number of coins used
printf("%i\n", count);
}
Your are stuck in infinite loop since your logic is wrong. Take a look in a while loop, for example:
while (cents % 25 >= 0)
{
count++;
cents = cents % 25;
}
modules operation will give you a number between 0 and 24. The condition will always be true regardless of what cents original value was.
You want to update your condition to a different one. take notice that inside your while you should update cents differently, since after the first iteration cents values will not change: let's say it is 10. It enters the while loop, and then cents=cents%25 will stay 10. Still infinite loop