pointer help

[amzc]

void strcpy(char *s, char *t)  {  while ( (*s++ = *t++) != '\0');}

If s is source string means it works correctly but actually I try to copy the t content into s.if t is source means it will coped two times so i could not understood this pointer....OMG...


Thank you...

[dariyoosh]

What is exactly the problem? there is a source string and a target string, it is up to the user to define the effective parameters properly while calling the function.


Regards,
Dariyoosh

[c99tutorial]

If s is source string means it works correctly but actually I try to copy the t content into s.if t is source means it will coped two times ...

The line

 while ( (*s++ = *t++) != '\0');

copies t to s until a null character is encountered in s. Notice this is the same as:

dest = source;

This means the value of source will be copied into dest. Intuitively speaking, the information moves from the right-hand side of the equals sign to the left-hand side. For this reason it is convient to define the strcpy arguments similarly:

strcpy(dest, source);

Of course, for your own functions you're free to use whatever convention is most convenient.