By: Prof. Fazal Rehman Shamil 

Last modified on January 29th, 2021

How to check if a sentence is a palindrome in C++?

We need to read from left and right, if the word is the same, whether we read it from left or we read it from right, then its called palindrome.

Example of palindrome

For example, “t4tutorials” is not a palindrome but “t4t” is a palindrome.

Write a C++ program to show whether a number is a palindrome or not using a do-while loop?

Flowchart of Palindrome Program using do-while loop

Code of Palindrome Program using do-while loop

#include<iostream>
using namespace std;
int main()
{
int num,r,sum=0,t;
cout<<"enter number"<<endl;
cin>>num;
t=num;
do
{
r=num%10;
sum=sum*10+r;
num=num/10;
}
while(num!=0);
if(t==sum)
{
cout<<"The number is a palindrome:";
}
else
cout<<"Number is not palidrome:";
}

#include<iostream>

using namespace std;

int main()

{

int num,r,sum=0,t;

cout<<"enter number"<<endl;

cin>>num;

t=num;

{

r=num%10;

sum=sum*10+r;

num=num/10;

}

while(num!=0);

if(t==sum)

{

cout<<"The number is a palindrome:";

}

else

cout<<"Number is not palidrome:";

}

Output

enter number

575

The number is a palindrome:

Suppose the input value is: 121

palindrome program in c++ using while loop

Excercise

Find the possible mistakes in the following Shamil’s Flow Table of the program to show whether a number is a palindrome or not using a do-while loop?

Loop execution	Condition Num !=0	What line will execute?	Operations performed
1^st time	True	1,2,3,4,5,6,7,8,9,10,11,12,13,14,15	r=12%10=2 sum=0*10+2=2 num=121/10=12
2^nd time	False	1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,9,10, 11,12,13,14,15, 16,17,18,19,22	r=1%10=1 sum=12*10+1=121 num=12/10=1
2^nd time	false	1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,9,10, 11,12,13,14,15, 16,20,21,22

Flowchart of Palindrome Program using for loop

palindrome program in c, cpp with flowchart — **Figure:** Palindrome program in C++ with the flowchart.

Palindrome Program using for loop for checking the numbers as a palindrome

#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int Input_Num;
int Orignal_Num;
int Reverse_Num;
int Remainder=0;
cout<<"Enter an Integer number:\n";
cin>>Input_Num;
Orignal_Num=Input_Num;
int lengthCount = 0;
for(; Input_Num != 0;)
{
Reverse_Num=Input_Num%10;
Input_Num /= 10;
Remainder=Remainder*10+Reverse_Num;
Reverse_Num=Remainder;
} 
if(Orignal_Num==Reverse_Num)
cout<<"Number You Entered Is Palindrome";
else
cout<<"Number Is Not Palindrome!!!";
getch();
}

#include <iostream>

#include <conio.h>

using namespace std;

int main()

{

int Input_Num;

int Orignal_Num;

int Reverse_Num;

int Remainder=0;

cout<<"Enter an Integer number:\n";

cin>>Input_Num;

Orignal_Num=Input_Num;

int lengthCount = 0;

for(; Input_Num != 0;)

{

Reverse_Num=Input_Num%10;

Input_Num /= 10;

Remainder=Remainder*10+Reverse_Num;

Reverse_Num=Remainder;

}

if(Orignal_Num==Reverse_Num)

cout<<"Number You Entered Is Palindrome";

else

cout<<"Number Is Not Palindrome!!!";

getch();

}

Output

palindrome program flowchart cpp, c — **Figure:** palindrome program flowchart CPP, C.

Palindrome Program using for loop for checking the strings as a palindrome

#include<iostream>
using namespace std;
int main()
{
int i,j,Number_Length,T4Tutorials_Flag=1;
char a[20];
cout<<"Enter a string:";
cin>>a;
for(Number_Length=0;a[Number_Length]!='\0';++Number_Length);
for(i=0,j=Number_Length-1;i<Number_Length/2;++i,--j)
{
if(a[j]!=a[i])
T4Tutorials_Flag=0;
}
if(T4Tutorials_Flag==1)
cout<<"\nThe string is Palindrome";
else
cout<<"\nThe string is not Palindrome";
return 0;
}

#include<iostream>

using namespace std;

int main()

{

int i,j,Number_Length,T4Tutorials_Flag=1;

char a[20];

cout<<"Enter a string:";

cin>>a;

for(Number_Length=0;a[Number_Length]!='\0';++Number_Length);

for(i=0,j=Number_Length-1;i<Number_Length/2;++i,--j)

{

if(a[j]!=a[i])

T4Tutorials_Flag=0;

}

if(T4Tutorials_Flag==1)

cout<<"\nThe string is Palindrome";

else

cout<<"\nThe string is not Palindrome";

return 0;

}

Palindrome recursion C++

#include <iostream>
using namespace std;
//Writing a Recursive function to check if string is a palindrome or not
bool isPalindrome(string str, int X, int Y)
{
// base case
if (X >= Y)
return true;
// return false if mismatch happens
if (str[X] != str[Y])
return false;
// move to next the pair
return isPalindrome(str, X + 1, Y - 1);
}
int main()
{
string str = "T4Tutorials";
int len = str.length();
if (isPalindrome(str, 0, len - 1))
cout << "its Palindrome";
else
cout << "sorry, its Not Palindrome";
return 0;
}

#include <iostream>

using namespace std;

//Writing a Recursive function to check if string is a palindrome or not

bool isPalindrome(string str, int X, int Y)

{

// base case

if (X >= Y)

return true;

// return false if mismatch happens

if (str[X] != str[Y])

return false;

// move to next the pair

return isPalindrome(str, X + 1, Y - 1);

}

int main()

{

string str = "T4Tutorials";

int len = str.length();

if (isPalindrome(str, 0, len - 1))

cout << "its Palindrome";

else

cout << "sorry, its Not Palindrome";

return 0;

}

Palindrome Program in C

#include <conio.h>
int main()
{
int Input_Num;
int Orignal_Num;
int Reverse_Num;
int Remainder=0;
printf("Enter an Integer Number:\n");
scanf("%d", &Input_Num);
Orignal_Num=Input_Num;
int lengthCount = 0;
for(; Input_Num != 0;)
{
Reverse_Num=Input_Num%10;
Input_Num /= 10;
Remainder=Remainder*10+Reverse_Num;
Reverse_Num=Remainder;
} 
if(Orignal_Num==Reverse_Num)
printf("Number You Entered Is Palindrome");
else
printf("Number Is Not Palindrome!!!");
getch();
}

#include <conio.h>

int main()

{

int Input_Num;

int Orignal_Num;

int Reverse_Num;

int Remainder=0;

printf("Enter an Integer Number:\n");

scanf("%d", &Input_Num);

Orignal_Num=Input_Num;

int lengthCount = 0;

for(; Input_Num != 0;)

{

Reverse_Num=Input_Num%10;

Input_Num /= 10;

Remainder=Remainder*10+Reverse_Num;

Reverse_Num=Remainder;

}

if(Orignal_Num==Reverse_Num)

printf("Number You Entered Is Palindrome");

else

printf("Number Is Not Palindrome!!!");

getch();

}

Output

Author
Recent Posts

Prof. Fazal Rehman Shamil

CEO @ T4Tutorials.com
I welcome to all of you if you want to discuss about any topic. Researchers, teachers and students are allowed to use the content for non commercial offline purpose. Further, You must use the reference of the website, if you want to use the partial content for research purpose.

Latest posts by Prof. Fazal Rehman Shamil (see all)

How Students Can Pick a Good Custom-Paper Writing Service? - March 5, 2021
List of Public service commissions - August 31, 2020
Comparison of fee structure of Pakistani Universities - June 1, 2020

Palindrome Program in C, C++, C Plus Plus (CPP) with flow chart

Write a C++ program to show whether a number is a palindrome or not using a do-while loop?

Flowchart of Palindrome Program using do-while loop

Code of Palindrome Program using do-while loop

Excercise

Flowchart of Palindrome Program using for loop

Palindrome Program using for loop for checking the numbers as a palindrome

Palindrome Program using for loop for checking the strings as a palindrome

Palindrome recursion C++

Related Posts:

lidyabetting.com