Question

C Programming. How to compare two sets of intergers which are inputted by the user? "cannot share any digit at the same place with your current PIN". Cant use any relational or logical operators.

Example Execution #1 ('3' digit in the hundreds place is common to both PINs):

Enter your current PIN: 12345

Enter your new PIN: 98310

Total number of invalid digits: 1

Problem: Your preferred banking institution is requiring that you change your five digit PIN in the name of security. One requirement of your new PIN is that it cannot share any digit at the same place with your current PIN. Given both the current and new PIN print the total number of invalid digits. Both PIN values will be in the range [00000, 99999] Example Execution #1 (3' digit in the hundreds place is common to both PINs): Enter your current PIN: 12345 Enter your new PIN: 98310 Total number of invalid digits:1 Example Execution #5: Enter your current PIN: 13433 Example Execution #2: Enter your current PIN: 01010 Enter your new PIN: 10101 Enter your new PIN: 43133 Total number of invalid digits: 3 Example Execution #6: Enter your current PIN: 19183 Total number of invalid digits: 0 Example Execution #3: Enter your current PIN 12345 Enter your new PIN: 22345 Enter your new PIN: 28273 Total number of invalid digits:1 Example Execution #7: Enter your current PIN: 12244 Total number of invalid digits: 4 Example Execution #4: Enter your current PIN: 99999 Enter your new PIN: 00000 Enter your new PIN: 44241 Total number of invalid digits: 0 Total number of invalid digits: 2 Please review the ASSIGNMENT REQUIREMENTS for this program. The use of selection, including logical and relational operators, is prohibited. The on pages techniques necessary to solve this problem are similar to the examples found e notes packet.

Example Execution #6:

Enter your current PIN: 19183

Enter your new PIN: 28273

Total number of invalid digits: 1

Dont use any relational or logical operators, dont use user defined functions (diff etc), dont use arrays. Refer to example below to solve.

Answer 1

#include<stdio.h>

int main() {
int oldPin;
int newPin;
int invalid=0;
printf("Enter your current pin:\n");
scanf("%d",&oldPin);
printf("Enter your new pin:\n ");
scanf("%d",&newPin);
while(oldPin>0 || newPin>0 )
{
if(oldPin%10==newPin%10)
{
invalid++;
}
oldPin=oldPin/10;
newPin=newPin/10;
}
printf("Total number of invalid digits are %d",invalid);
}