456 sum is 15

Code
int sumDigits(int n) { 
int sum = 0; 
 
while( n > 0 ) { 
sum += (n % 10); // add last digit of n to sum 
n /= 10; // divide n by 10 to "chop off" the last digit 
} 
 
return sum; 
 
getch();
}

Code
#include<stdio.h>
#include<conio.h>
main()
{
        float f;
        int s,r,k=1;
        printf("Enter the number:=>");
        scanf("%f",&f);
        s=f/1;
        while(k==1)
        {
                r=s%10;
                printf("%d
",r);
                k++;
        }
        return 0;
} 

OK,but my question is... In HttpServlet class service method calls doGet() or doPost() method .Intead of overriding doGet() or doPost(),why should we not override service() method itself?????

Yes we can override the service method in our servlet class. If we override the service method then we lose the functionality provided by the httpServlet class and doXXX() methods will not be called ...