I was working on a problem which was fairly simple but I came across an issue and was uncertain why the program was not working the way I wanted it to. The problem asked us to make a Palindrome test with and use functions. I was able to do all of that but in the question it also asked us to make sure the user input was a 5 digit number. This is what I did in my code:
do {
printf("Please Enter a positive 5-digit number: "); //Ask & receive input
scanf("%d", &number);
countdigs = countDigits(number); //
}while((countdigs != 5) && (number <0) );//keep going throught the loop while the number is less than 0 and is not equal to 5 digits
palindrome(number); //palindrome
this is my palindrome function
void palindrome (int number) //create palindrome procedure
{
int remainder,reversedNumber=0,original; //initialize variables
original = number; //set original number to a new var
while (number != 0) //while the number is not 0
{
remainder = number %10; //get remainder of original number
reversedNumber = (reversedNumber*10) + remainder; //construct reversed
number
number = number / 10; //go to the next digit
}
//printf("OG = %d",original); //check
//printf("rev = %d", reversedNumber); //check
if (original == reversedNumber) //if the original number and reversed
number are the same
{
printf("The number %d is a palindrome.\n",original); //print solution
}
else //if not the same
{
printf("The number %d is not a palindrome.\n",original); //print solution
}
}
and this is my countDigits function
int countDigits(int number) //setup recursive function
{
int number_length=0; //initialize number length
while(number != 0) //while the number is not 0
{
number = number/10; //divide number by 10 to get to next digit
number_length = number_length + 1; //increase counter by 1
}
return number_length; //return the counter
printf("length %d",number_length);
}
The issue I am having is in this code (countdigs != 5) which is the check to make sure the number is a positive (works fine), and makes sure the number is of length 5. However, I could not get it to work.
The problem said not to use any string function (length function)
I guess the issue is at the very beginning:
do {
printf("Please Enter a positive 5-digit number: ");
scanf("%d", &number);
countdigs = countDigits(number);
} while((countdigs != 5) && (number < 0) );
We should ask user for an input again if countdigs != 5 OR number is negative, i.e.:
do {
printf("Please Enter a positive 5-digit number: ");
scanf("%d", &number);
countdigs = countDigits(number);
} while((countdigs != 5) || (number < 0) );