C Exercises: Check a given string is Palindrome or not
C Recursion : Exercise-16 with Solution
Write a program in C to Check whether a given string is Palindrome or not.
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
#include <string.h>
void checkPalindrome(char [], int);
int main()
{
char wordPal[25];
printf("\n\n Recursion : Check a given string is Palindrome or not :\n");
printf("----------------------------------------------------------\n");
printf(" Input a word to check for palindrome : ");
scanf("%s", wordPal);
checkPalindrome(wordPal, 0);//call the function for checking Palindorem
return 0;
}
void checkPalindrome(char wordPal[], int index)
{
int len = strlen(wordPal) - (index + 1);
if (wordPal[index] == wordPal[len])
{
if (index + 1 == len || index == len)
{
printf(" The entered word is a palindrome.\n\n");
return;
}
checkPalindrome(wordPal, index + 1);//calling the function itself recursively
}
else
{
printf(" The entered word is not a palindrome.\n\n");
}
}
Sample Output:
Recursion : Check a given string is Palindrome or not : ---------------------------------------------------------- Input a word to check for palindrome : mom The entered word is a palindrome.
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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