Sum the selected digits

If a four digit integer number is input through the keyboard then write a c program to find the sum of first and  before last digit.

#include<stdio.h>
main()
{
    int i,j,num,first,sum=0,beforelast,temp=0;
    printf("Enter the number:");
    scanf("%d",&num);
    for(i=1;i<=2;i++)
    {
       for(j=1;j<=i;j++)
        first=num%10;
        num/=10;
    }
    while(num!=0)
{
beforelast=num;
num=num/10;
}
sum=first+beforelast;
printf("\nSum of first digit and  before last digit is:%d\n",sum);
}