Input four digits nob & print sum of 1st & last digit.

#include<stdio.h>
main()
{
 
 int num,sum,a,b,c,d,d1,d2,d3,d4;
 printf("Enter any four digits number:");
 scanf("%d",&num);
 a=num/10;
 d4=num%10;
 b=a/10;
 d3=a%10;
 c=b/10;
 d2=b%10;
 d=c/10;
 d1=c%10;
 sum=d1+d4;
 printf("\n sum of 1st digitand 4th digit= %d",sum); 
 
 
}

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