Pointer Example

/*
 * Get the length of a string
 */
int strlen(char * s)						
{
    register int i = 0;
    while (s[i] != '\0') i++;
    return(i);
}

/* 
 * Copy src to dest
 */
void strcpy(char * dest, char * src)		
{
    while('\0' != (*dest++ = *src++)) ;
}

/* 
 * append to the string dest 
 */
void strcat(char * dest, char * add)	   
{
    while('\0' != *left) left++; 
    while('\0' != (*left++ = *right++));
}

/*
 * Compare two strings. 
 * return < 0 if s0 if s>t
 */
int strcmp(char *s, char *t)		
{
    while((*s == *t) && (*s != '\0')) s++, t++;
    return(*s - *t);
}