Unable to print the total of all digits as part of solving credit card problem

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Which part of the problem are you working on?

Summing the digits

What problem are you having?

#include <stdio.h> 
#include <cs50.h> 
int main(void) 
{ 
    long creditcardno; 
    do 
    { 
        creditcardno = get_long("enter");
    } 
    while (creditcardno < 1000000000000 || creditcardno > 9999999999999999);
    int i = 0; 
    long cc = creditcardno; 
    while (cc > 0) 
    { 
        cc = cc / 10; 
        i++; 
    } 
    printf("%d", i);

   if (i == 14) 
   printf ("invalid"); 
   return 0; 
   int sum1 = 0; 
   int mod1 = 0; 
   int mm = creditcardno; 
   do 
       {mod1 = mm%10; 
       mm = mm/10; 
       sum1 = sum1 + mod1; 
       } 
    while (mm > 0); 
    printf ("number%d", sum1); 
}

While the program seems to be working for accepting input for credit card no. if only the digits are between 12 to 15 digits, and giving output of invalid if 14 digits entered, I am unable to get the sum of all the digits as part of solving the next leg of the problem.

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https://edstem.org/us/courses/176/discussion/667982?answer=1606799[learn_press_profile]

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