c program for addition subtraction multiplication and division using function

#include<stdio.h>
void main()
{
    int a,b,c,d,e,f;
    clrscr();
    printf("Enter Two Values :");
    scanf("%d%d",&a,&b);
    sum(a,b);
    sub(a,b);
    mult(a,b);
    div(a,b);
    getch();
}
    sum(int x,int y)
    {
        int z;
        z=x+y;
        printf("Addtion : %d\n",z);
        return 0;
    }
    sub(int x,int y)
    {
        int z;
        z=x-y;
        printf("Subtraction : %d\n",z);
        return 0;
    }
    mult(int x,int y)
    {
        int z;
        z=x*y;
        printf("Multiply : %d\n",z);
        return 0;
    }
    div(int x,int y)
    {
        int z;
        z=x/y;
        printf("Div : %d\n",z);
        return 0;
    }
                                

Enter Two Values: 50 10
Addtion : 60
Subtraction : 40
Multiply : 500
Div : 5