Arithmetic Calculator

#include<stdio.h>
int add(int a,int b)
{
    return(a+b);
}
int sub(int a,int b)
{
    return(a-b);
}
int mul(int a,int b)
{
    return(a*b);
}
int div(int a,int b)
{
    return(a/b);
}
int mod(int a,int b)
{
    return(a%b);
}

void main()
{
int a,b,ch;
char con;
do
{
    printf("\t Arithmetic Operations");
    printf("\n\t1-Addition\n\t2-Subtraction");
    printf("\n\t3-Multiplication\n\t4-Division\n\t5-modulus");
    printf("\n Enter your choice :");
    scanf("%d",&ch);
    printf("\nEnter the First number:");
    scanf("%d",&a);
    printf("\nEnter the Second Number:");
    scanf("%d",&b);
    switch(ch)
    {

    case 1:
        printf("\nAddition =%d",add(a,b));
        break;
    case 2:
        printf("\n\t Subtraction=%d",sub(a,b));
        break;
    case 3:
        printf("\n\tMultiplication=%d",mul(a,b));
        break;
    case 4:
        printf("\n\tDivision=%d",div(a,b));
        break;
    case 5:
        printf("\n\tModulus=%d",mod(a,b));
        break;
    default:
        printf("\nInvalid Option");
    }
    printf("\nPress Y to continue:");
    scanf("%s",&con);
}while(con=='Y'||con=='y');
}