This is a C++ Program to Find if a String is Palindrome.
The program checks if a string is a palindrome or not. A palindrome is a word or a string that reads the same backward and forward.
1. The program takes a string and stores it.
2. The string is copied into another string from backwards.
3. If both the strings are equal, then the entered string is a palindrome.
4. Else it is not.
5. The result is printed.
6. Exit.
Here is the source code of C++ Program to Find if a String is Palindrome. The program output is shown below.
#include <iostream>#include <string.h>using namespace std;
int main()
{char str1[20], str2[20];
int i, j, len = 0, flag = 0;
cout << "Enter the string : ";
gets(str1);
len = strlen(str1) - 1;
for (i = len, j = 0; i >= 0 ; i--, j++)
str2[j] = str1[i];
if (strcmp(str1, str2))
flag = 1;
if (flag == 1)
cout << str1 << " is not a palindrome";
elsecout << str1 << " is a palindrome";
return 0;
}
1. The user is asked to enter a string and it is stored in the character variable ‘str1’.
2. The length of str1 is stored in ‘len’ using the string function strlen().
3. Using a for loop, str1 is copied into another variable ‘str2’ from backwards.
4. Both the strings str1 and str2 are compared using string function strcmp().
5. A temporary variable flag is used.
6. If str1 is equal to str2, then the entered string is a palindrome, else not.
7. The result is then printed.
Case 1 : Enter the string : nun nun is a palindrome Case 2 : Enter the string : fast fast is not a palindrome Case 3 : Enter the string : 121 121 is a palindrome
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