Thread: Please tell me where my code is incorrect.

Perhaps you would get some help if you took the effort to ensure that your code posted properly.

Code:

#include <stdio.h>
#include <stdlib.h>


int main()
{
    char s[]="C a of";
    char t[]="is philosophy life";
    char u[40];
    char ........=s,*tt=t,*uu=u;
    while(........||*tt)
    {
        while(........)
        {
            if((*uu++ = ........++)=='')
                break;
        }
        while(*tt)
        {
            if((*uu++ = *tt++)=='')
                break;
        }
    }
    *uu='\0';
    puts(u);


    printf("Hello world!\n");
    return 0;


}

Sorry for the inconvenience.
This is the correct code.
Error it gives with gnu c++ compiler is: empty charater constant at line 14 and 19

Well, that's because you have an empty character constant on lines 14 and 19. (In the posted example, they appear on lines 15 and 20 for whatever reason.) You need to decide what character you meant that to be, and put it there. I suspect, just based on rearranging the words into a sentence, that you're looking for a space character.