Dividsion by zero not show error

[tooawesome]

Hello can someone help i'm having some problems whit my cocculator if i divide 1/0 or 2/0 etc. It isn't write an error its shows 0. Maybe someone can give advise what and in which place i have to write .

#include <stdio.h>
#include <stdlib.h>

int addition(int a,int b)
{return a+b;};

int substraction(int a, int b)
{return a-b;};

int division(int a, int b)
{return a/b;};

int multiplication(int a, int b)
{return a*b;};


int main() {
int a,b,rez;
char c;
for(;;) {

printf("Welcome to coculator.\n");
printf("Please choose an option by entering the number, press q to quit\n");
printf("1-Addtion\n");
printf("2-Substraction\n");
printf("3-Division\n");
printf("4-Multiplication\n");
printf("--------------------------------------------------------------------------\n");

char num;
scanf("%d", &num);

printf(" Enter the first number:\n");
scanf("%d", &a);
printf("Enter the second number:\n");
scanf("%d", &b);

if (num == 1){
rez=addition(a,b);
printf("%d\n",rez);
}
else if (num == 2){
rez=substraction(a,b);
printf("%d\n",rez);
}
else if (num == 3){
rez=division(a,b);
printf("%d\n",rez);

}
else if (num == 4){
rez=multiplication(a,b);
printf("%d\n",rez);
}
else {
printf("You chose the wrong number! Try another one.");
}
scanf("%c", &c);
if (c == 'q')
break;

[vlad from moscow]

In your menu the following is written

printf("3-Division\n");

However then in the seria of if-else statements the following code corresponds to selection with number 3

else if (num == 3){
rez=multiplication(a,b);
printf("%d\n",rez);

}

So instead of division you perform multiplication.

[tooawesome]

Thanks i change my mistake maybe you now how to show error when i divided whit 0?

[ProgramingNewb]

I'm not really familiar with this language but I'm basic c++ you can just make an if statement like

If(number/0)
Cout<<"error, divided by zero"<<endl;
Maybe this will help u

[tooawesome]

Still problem is not solved :/ but still thanks

[guestgulkan]

This is straight forward.

You simply cannot divide by 0 - so there is no point in carrying out the
divison function.

else if (num == 3)
{
    if (b ==0)
   {
     printf ("Not possible to divide by zero");
    }

    else //only carry out the division if  denominator is not zero
   {
        rez=division(a,b);
        printf("%d\n",rez);
    }

}

[tooawesome]

Thank you very much :)

[TheIdeasMan]

Try to avoid infinite loops like this:

for(;;) {

You would be much better to make use of a bool variable and test that in a while loop condition.

bool Quit = false;

while(!Quit) {
// your code

//user wants to quit
Quit = true;
}

There are valid situations to use infinite loops, but this isn't one of them.