17-10-2011 Sum Using a function(function changes values before adding)

/*program uses a function to add two digits but function changes passed values before adding them*/

#include<stdio.h>

#include<conio.h>

int sum(int,int);

main()

{

      int dig1,dig2,result;

      dig1 = 10;

      dig2 =5;

      /*calling function and storing rturned value in variable result*/

      result = sum(dig1,dig2);

      printf("%d",result);

      getche();

      return 0;

}

/*Defining functions*/

int sum(int digi1, int digi2)

{

    digi1 =2;

    digi2 =3;

    int add;

    add = digi1 + digi2;

    return add;

}