#include using namespace std; //test start /* int reverse_digit[16]; void test(int b){ while (b < 16){ cout << "_" <> credit_card; long int n = credit_card ; int digit; int i = 0,j = 0; int reverse_digit[16]; //when test start, make this line comments int sum = 0; int num = 1; // loop variable to multiple even position integer int multi_count;//array even position digit control variable long int test_digit1;//testing array length int test_digit2[30]; int n1, n2; int array_length = 0,o = 0 ,p = 0,q; int p1 =0,q1 =15, reverse_digit1[16]; test_digit1 = credit_card; while(test_digit1 != 0){ n1 = test_digit1 % 10; test_digit1 = test_digit1 / 10; array_length ++; } if(array_length > 16){ test_digit1 = credit_card; while(test_digit1 != 0){ n2 = test_digit1 % 10; test_digit2[o] = n2; test_digit1 = test_digit1 / 10; //cout << "_" < 9){ reverse_digit[l] = reverse_digit[l] - 9; //numbers greater than 9 is // substracted by 9 } }//test(0);cout <<"substracted\n"<< endl; for(int m =0; m < 16; m++){ sum = sum + reverse_digit[m]; //sum of digit is calculated }//cout <

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