why do i always get true in the loop?
hello, i really dont know why ?
to let you know what i intend to do , please read this question "
[Finding a palindrome number ]
"A palindrome is a number or a text phrase that reads the same backwards as forwards.
For example, each of the following five-digit integers is a palindrome: 12321, 55555,
45554 and 11611. Write a program that reads in a five-digit integer and determines
whether it is a palindrome. [Hint: Use the division and modulus operators to separate
the number into its individual digits.]"
after going through the usual way of separating of digits ... to show that if two numbers
(the original one and the new generated number) i used the logical And operator (&&) ..
so that if the two numbers are the same it would generate the number 1
which is considered true in C++ ... and if not ,, it will produce 0 that is False.
but when compiling the program . i always get "true" in loop continuation condition
and thus i fail ! i tried to use equality operator (==) to check
whether two numbers are the same , but again no luck ! i get that damn true in loop -continuation condition
!then after some time of contemplating i come up with the second solution ,
that only works with 5 digit numbers ! ( and im not fond of using it , cuz i think this kind of solution is not right , and it just doesnt feel good !
now i just wana know why this happens , and where i made my mistake ! and what is (or are ) my mistake(s) ...
any comment is greatly appreciated .
first snippets of code:
Code:
//In the Name Of God
/*
4.26 A palindrome is a number or a text phrase that reads the same
backwards as forwards. For example, each of the following five-digit integers
is a palindrome: 12321, 55555, 45554 and 11611. Write a program that reads
in a five-digit integer and determines whether it is a palindrome
. [Hint: Use the division and modulus operators to separate the number into its individual digits.]
*/
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
using std::boolalpha;// causes bool values to print as "true" or "false"
#include <iomanip>
using std::setw;
int main()
{
int num;
int temp;
int shadow;
int mirror;/* a copy of original number is created to be compared
with the new generated number to find out where it is a palindrome number !*/
const int digit =5;
cout<<"Please Enter a 5 digit number (ex:55555): ";
cin>>num;
mirror=num;
/*The while works fine , but when i use && to assure that
two numbers are the same , it always gives a True condition! why?
*/this made me to write that kind of statement.
while( num!=0)
{
temp=num/10;
shadow=num%10;//new number to generate
num=temp;
}
if ( (shadow&&mirror)==true )
{
cout<<boolalpha<<endl<<setw(5)<<(shadow&&mirror);
cout<<"\n\n A Palindrome number found! ";
cout<<"\n The number You have Entered is a Palindrome number ("<<mirror<<")\n\n";
}
else //if ( (shadow&&mirror)== false )
{
cout<<boolalpha<<!(shadow&&mirror);
cout<<"\nThe number You have Entered Is not Palindrome "<<endl;
}
return 0;
}
program number 2: using a very terrible way to solve the assignment !:
Code:
//In the Name Of God
/*
4.26 A palindrome is a number or a text phrase that reads the same backwards as forwards
. For example, each of the following five-digit integers is a palindrome: 12321, 55555,
45554 and 11611. Write a program that reads in a five-digit integer and determines
whether it is a palindrome. [Hint: Use the division and modulus operators to separate
the number into its individual digits.]
*/
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
using std::boolalpha;// causes bool values to print as "true" or "false"
#include <iomanip>
using std::setw;
int main()
{
int num;
int temp;
int shadow,last2;
int mirror,first2;
const int digit =5;
cout<<"Please Enter a 5 digit number (ex:55555): ";
cin>>num;
mirror=num;
// the while here is useless! see the comment underneath !
while( num!=0)
{
temp=num/10;
shadow=num%10;
num=temp;
}
// here is the solution i found to this.!
first2=mirror%100;
last2=mirror/1000;
if ( (first2==last2) )
{
cout<<"\n\n A Palindrome number found! ";
cout<<"\n The number You have Entered is a Palindrome number ("<<mirror<<")\n\n";
}
else //if ( (shadow&&mirror)== false )
{
cout<<"\nThe number You have Entered Is not A Palindrome "
<<"\n\nfirst2 && last2 = "<<(last2&&first2)<<" but Why?!\n\n";
}
cout<<"\n\n\n\n\nfirst2 digits (%100) "<<first2
<<"\n\nFrom "<<mirror<<endl<<endl
<<"last2 digits (/1000) "<<last2
<<"\n\nfirst2 && last2 = "<<(last2&&first2)<<" !\n\n";
return 0;
}
thanks a million in advance !
(by the way i use code::blocks 8.2 compiler )
