Function Examples(No Pass and No Return) Set 3

Question:8
Write a function in C language for the following:
1. Max of 3 nos
2. Min of 3 nos
3. Table of a no
4. Exit
Sol:

#include <stdio.h>

void max()
{
    int a,b,c,m;
    printf("Enter 3 nos ");
    scanf("%d %d %d",&a,&b,&c);
    if(a>b && a>c)
        m=a;
    else
        if(b>c)
        m=b;
    else
        m=c;
    printf("Max no = %d\n",m);
}
void min()
{
    int a,b,c,m;
    printf("Enter 3 nos ");
    scanf("%d %d %d",&a,&b,&c);
    if(a<b && a<c)
        m=a;
    else
        if(b<c)
        m=b;
    else
        m=c;
    printf("Min no  = %d\n",m);
}
void table()
{
    int n,i,t;
    printf("Enter any no ");
    scanf("%d",&n);
    for(i=1;i<=10;i++)
    {
        t=n*i;
        printf("%d * %d = %d\n",n,i,t);
    }
}
int main()
{
    int op=0;
    while(op!=4)
    {
        printf("1. Max of 3 nos\n");
        printf("2. Min of 3 nos\n");
        printf("3. Table of a no\n");
        printf("4. Exit\n");
        printf("Enter your choice ");
        scanf("%d",&op);
        switch(op)
        {
        case 1:
            max();
            break;
        case 2:
            min();
            break;
        case 3:
            table();
            break;
        case 4:
            printf("End");
            break;
        default:
            printf("Invalid choice\n");
            break;
        }
        getch();
    }
    return 0;
}