#include <stdio.h>
int main(){
int a,b;
printf("Enter a number: ");
scanf("%d", &a);
printf("Enter your choice: ");
scanf("%d", &b);

switch(b){
case 1:
    if(a%7==0)
    printf("Divisable by 7");
    else
    printf("Not divisable by 7");
    break;
case 2:
        if (a>=0)
            printf("The number is not negetive");
        if (a<0)
            printf("The number is negetive");
        break;
case 3:
    if((a>100)&&(a%3!=0))
        printf("Greater than 100 and not divisable by 3.");
        break;
default:
    printf("invalid input.");
}
return 0;
}