FACING PROBLEM WHILE COMPARING "Hello" with "olleH"

Question

I am trying to make a program in c where it can identify if a string is equal to its reverse or not.

#include <stdio.h>
#include <string.h>
#include <conio.h>
int main(){
    char str1[10] = "Hello";
    if (str1 == strrev(str1)){
        printf("True");
    }
    else{
        printf("False");
    }
getch();
return 0;
}

According to my knowledge, it should print False but it is printing True instead. Can anyone fix this issue. Thanks

Answer 1

It seems the function strrev does not create a new character array. It reverses a string in place. So in this if statement

if (str1 == strrev(str1)){

there are compared two pointers to the first element of the same character array str1.

To compare two strings use the standard C function strcmp. For example

char str1[10] = "Hello";
char str2[10];

strcpy( str2, str1 );

if ( strcmp( str1, strrev(str2) ) == 0 ){
    printf("True");
}
else{
    printf("False");
}