Thread: strcat program

i read C Programming Language chapter 2-2.8 and wrote a strcat program

Code:

#include <stdio.h>

void cat(char s[],char t[]);

main()
{

char s[]="Hello ";
char t[]="World";

printf("%s\n",cat(s,t));

}

void cat(char s[],char t[])
{
int i,j;
i=j=0;

while(s[i] != '\0')
i++;
while((s[i++]=t[j++]) != '\0');

}

when i try to compile using gcc i get
In function `main':
11: invalid use of void expression
Why is that invalid?
then i replace void cat(... with int cat(... and it compiles but when i run it , it prints crap like
42@øÿ¿Døÿ¿ÌH@î@World

thanks a lot , it works fine now

I'm sure that it appears to work just fine, but you still have a rather serious problem. Turn back to the last paragraph on the previous page (47) which says in part: "strcat assumes that there is enough space in s to hold the combination." Is there?

Hint: how large is the array 's' in main? How big does an array need to be to hold "Hello World" plus a '\0' terminator?

HTH,
Will