Division error by zero

Question

I am a beginner in programming and I have to assemble a code in which I put two values and the program gives me the result in sum, subtraction, multiplication and division, but when dividing a number by zero an error message appears. I was able to get an error message to appear if it is divided by zero, but I can’t do any other kind of division than zero. If anyone can enlighten me because I understand little yet of programming.

That is the code:

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

int main()
{
  int num1, num2, soma, subtracao, multiplicacao, divisao;

  printf("Digite o primeiro numero:");
  scanf_s("%d", &num1);

  printf("Digite o segundo numero:");
  scanf_s("%d", &num2);

  soma = num1 + num2;
  subtracao = num1 - num2;
  multiplicacao = num1 * num2;
  divisao = num1 / num2;

  printf("A soma = %d\n", soma);
  printf("\n");
  printf("A subtracao = %d\n", subtracao);
  printf("\n");
  printf("A multiplicacao = %d\n", multiplicacao);
  printf("\n");
  printf("A divisao = %d\n", divisao);

  if (num2 != 0)
    divisao = num1 / num2;
  else
    printf("Invalido, nao pode ser divido por 0");

  printf("\n");

  system("pause");
  return 0;
}

Answer 1

Its logic to verify if the variable num2 is equal to zero is right, but it is being executed after the division, its code should look something like this:

int num1, num2, soma, subtracao, multiplicacao, divisao;

printf("Digite o primeiro numero:");
scanf_s("%d", &num1);

printf("Digite o segundo numero:");
scanf_s("%d", &num2);



soma = num1 + num2;
subtracao = num1 - num2;
multiplicacao = num1 * num2;

divisao = -9999; //um valor estranho pra ser interpretado como um erro
if (num2 != 0)
    divisao = num1 / num2;
else
    printf("Invalido, nao pode ser divido por 0");

printf("A soma = %d\n", soma);
printf("\n");
printf("A subtracao = %d\n", subtracao);
printf("\n");
printf("A multiplicacao = %d\n", multiplicacao);
printf("\n");
printf("A divisao = %d\n", divisao);

system("pause");
return 0;

Remember, always check for anything that might go wrong before of the execution.

Answer 2

Print the split output only if such an operation is possible.

#include <stdio.h>

int main() {
    int num1, num2, soma, subtracao, multiplicacao, divisao;

    printf("Digite o primeiro numero:");
    scanf("%d", &num1);

    printf("Digite o segundo numero:");
    scanf("%d", &num2);

    soma = num1 + num2;
    subtracao = num1 - num2;
    multiplicacao = num1 * num2;

    printf("A soma = %d\n\n", soma);
    printf("A subtracao = %d\n\n", subtracao);
    printf("A multiplicacao = %d\n\n", multiplicacao);

    if (num2 != 0) {
        divisao = num1 / num2;
        printf("A divisao = %d\n\n", divisao);
    }
    else
        printf("Invalido, nao pode ser divido por 0\n\n");

    system("pause");
    return 0;
}