To check Sign using Switch case

 #include <stdio.h>

int main() {
    int num;
    printf("Enter no.: ");
    scanf("%d",&num);
    switch(num>0){
        case 1:
           printf("%d is Positive no.",num);
           break;
        case 0:
           switch(num<0){
               case 1:
                   printf("%d is Negative no.",num);
                   break;
               case 0:
                   printf("%d is Zero",num);
                   break;
           }
    }
    return 0;
}

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