Thread: seperating numbers

  1. #1
    Registered User
    Join Date
    Sep 2002

    Unhappy seperating numbers

    I am to determine if a number is a palindrome.

    How do i go about seperating a 7 digit number to see if it is a palindrome.

    I can only use basic if/else statements and other basic knowledge.

    How do i seperate a 7 digit number into single digits to compare?
    Last edited by fireguy; 09-12-2002 at 11:00 PM.

  2. #2
    Just because ygfperson's Avatar
    Join Date
    Jan 2002
    1) find out the number of digits your number has.
    2) seperate your number into all the digits
    3) check each number with its opposite
    4) if every number matches a pattern, say so

    this is fairly easy to implement.

  3. #3
    Registered User fry's Avatar
    Join Date
    Mar 2002
    Have a search around for how to use modulus. It will show you how to split the number up.
    IDE: Dev C++ 5
    Lib: Allegro
    OS: Windows 2000

  4. #4
    &TH of undefined behavior Fordy's Avatar
    Join Date
    Aug 2001
    Its easier to turn the number into a char array....

    #include <iostream>
    #include <cstdio>
    using std::cout;
    using std::endl;
    bool isPal(int y){	
    	int a,b,c;
    	char buff[20];	
    	b = sprintf(buff,"%d",y);//get char array
    	c = b / 2;//times to loop. If odd, then carry is lost
    	for(a = 0,--b;c;a++,b--,c--){
    		if(buff[a] == buff[b])
    			continue;//Same.....good, go again
    		else{//1 difference, so no pallindrome
    			cout << buff << " is not a palindrome" << endl;
    			return false;
    	cout << buff << " is a palindrome" << endl;
    	return true;
    int main()
    	return 0;

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