Thread: Cant make "do while" work

Hello I can run the program but the problem is that I want it to end it when I type the correct number(so ">0") but it doesn´t work and well I don´t know why.

Code:

#include <stdio.h>#include <stdlib.h>
void converttokoruna(float euro);
float euro;


int main()
{
        float koruna= 0;
    do{
    scanf("%f", &koruna);
converttokoruna(koruna);
    }while(euro = !0);


    return 0;
}


void converttokoruna(float euro){
    float koruna = euro * 24.79;
    if(euro > 0)
    {
    printf("%.2f Eur - %.2f Korun\n", euro, koruna);
    }
    else
    {
        printf("False number ! Write number again\n");
    }
    return;
}

The problem is in the condition:
while(euro = !0)
Several issues with this.
1. !0 is actually a Boolean expression, so we can simplify it to 1 (NOT 0 is 1)
2. Then you have the euro = 1 itself, which assigns (not compares, which would still be wrong) 1 to euro, so we can simplify again:

while(1)
Looks like an infinite loop to me.

You probably meant this: while(euro != 0.00f)