Problem with SWITCH

Question

I have a problem in the code of an activity of the Analysis course.

The structure of my code is this:

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

int main(){

    int num,menu, i,result, primo;

do{
    printf("Menu de Atividades");
    printf("Digite 1 para verificar numeros primos\nDigite 2 para verificar o cubo do numero desejado");
    switch(menu)
    case 1:
        printf("Digite um numero para verificar se e primo: ");
        scanf("%i",&num);
        primo = 0;
        for(i=1; i<=num; i++)
            if((num%i)==0)
                 primo++;
        if(primo>2)
            printf("%d nao e primo\n", num);

        else
            printf("%d e primo\n", num);
    break;
    case 2:
        printf("Digite um numero: \n");
        scanf("%i", &num);
        result = num*num*num;
        printf("O cubo de %i eh %i", num, result);
    break;
    default:
    break;

}while(menu !=0)
}

I am trying to make a menu to put 2 activities here, the first is to receive a number and return whether or not it is prime, the second is simply receive the number and return the cube.

I managed to do the activities, but I’m having a hard time finishing this menu, because I’m not finding my mistake, and even searching on google I could not solve.

The program I use is Dev C++ and it is returning that has some fault in Switch that I couldn’t locate.

Answer 1

In the switch-case structure, keys are missing.

switch(menu)
{
    case 1:
        printf("Digite um numero para verificar se e primo: ");
        scanf("%i",&num);
        primo = 0;
        for(i=1; i<=num; i++)
            if((num%i)==0)
                 primo++;
        if(primo>2)
            printf("%d nao e primo\n", num);

        else
            printf("%d e primo\n", num);
    break;
    case 2:
        printf("Digite um numero: \n");
        scanf("%i", &num);
        result = num*num*num;
        printf("O cubo de %i eh %i", num, result);
    break;
    default:
    break;
}