Exercise 5.03

Page 107

Write a pointer version of the function strcat that we showed in Chapter 2: strcat(s,t) copies the string t to the end of s.

#include <stdio.h>
#define MAXLEN 1000

int str_cat(char *s, char *t);

int main()
{
	char str1[MAXLEN] = "Hello";
	char *str2 = " world!";

	str_cat(str1, str2);

	printf("%s\n", str1);
}

int str_cat(char *s, char *t)
{
	int i;

	for (i = 0; *s != '\0'; s++, i++)
		;

	for (; (*s = *t) != '\0'; s++, t++, i++)
		;

	return i;
}