How to create a Palindrome function in C++? I'm using 2 functions types(bool and void). Here is my code so far (I would really appreciate any help with this, and why my code is not working?) Thank you!
#include <iostream>
#include <cctype>
#include <cstdlib>
#include <string>
using namespace std;
void reverse(char *);
bool isPalindrome(char *);
int main()
{
char a[10];
cout << "string ";
cin.getline(a, 10);
if (palindrome(a))
cout << "true";
else
cout << "false";
return 0;
}
void reverse(char *s)
{
char *point = s;
int i, min;
for (i = 0; *point != '\0'; i++)
point++;
min = i;
point--;
for (i = min; i > 0; i--)
{
cout << *point--;
}
}
bool ispalindrome(char *s)
{
bool status;
char *original = s;
char *point = s;
reverse(point);
for (int i = 0; point != '\0'; i++)
{
if (point[i] == original[i])
status = true;
else
status = false;
}
return status;
}
you dont need to reverse the string to check if its palindrome.
the algorithm works like:
get the length of the string;
loop from zero to length of string by 2;
compare the characters on position loop count with lenght minus loop count minus 1;
if the are not equal its not a palindrom;
its a palindrome if the loop finished;
for example: "test":
first step: compare 't' with 't'
second step: compare 'e' with 's' --> not a palindrom
for example "palap":
first step: compare 'p' with 'p'
second step: compare 'a' with 'a'
third step: compare 'l' with 'l'
now we know that it is a palindrom.
try thisone:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int palindrom(char * s){
int i;
int l = strlen(s);
for(i=0;i<=l/2;i++)
if(s[i]!=s[l-i-1]) return 0;
return 1;
}
int main(void) {
char * test = "test";
char * pal = "palap";
printf("%s %d", test, palindrom(test));
printf("%s %d", pal, palindrom(pal));
return 0;
}
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