# Palindrome using string function

Palindrome using string function

Palindrome String means that string spelled as same as in reverse. that is considering we have a string name now reverse that string if reversed string matches with the original string then that string is referred as palindrome string.

Example :

Ankit is not a palindrome

ABA is palindrome

In above example, Ankit  => reverse string we get tikna as a string which is different from the original string so it’s not a palindrome. Similarly ABA => reverse string we get ABA which is same as an original string so its palindrome string.

program:

## Palindrome program using string function

Output:

Explanation :

2. first write main function where program execution starts.

3. Declare variables

string1 => to store string

i, j => temporary variables

flag =0 => flag

length => to store length of string

4. Take a string input from user.

Example  ; ABBA

5. Next calculate length of the string so that we can check for palindrome string

for this we use strlen() in string class.

length = strlen(string1);

6. After this loop length = 4

7. Next we check palindrome string from start to end

for(i=0;i < length ;i++)  is to check string end

At iteration 1 :

i =0 , 0 < 4 this condition becomes true and loop executed

if(string1[i] != string1[length-i-1])   => A ! = A this condition become false and if block skipped and value  of i is increment in for loop

At iteration 2 :

i =1 , 1 < 4 this condition becomes true and loop executed

if(string1[i] != string1[length-i-1])   => B ! = B  this condition become false and if block skipped and value  of i is increment in for loop

At iteration 3:

i =2 , 2< 4 this condition becomes true and loop executed

if(string1[i] != string1[length-i-1])   => B ! = B this condition become false and if block skipped and value  of i is increment in for loop

At iteration 4 :

i =3 , 3 < 4 this condition becomes true and loop executed

if(string1[i] != string1[length-i-1])   => A ! = A this condition become false and if block skipped and value  of i is increment in for loop

At iteration 5:

i =4, 40 < 4 this condition becomes false and loop execution stops

7. Now check for flag value if flag =1 then string is not palindrome.

8. And flag =0 then string is palindrome.

9. then print string is palindrome.

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