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

int main\(\)
{
	/* define 3 immutable strings */
	char word[]= "hello there";
	char stuff[10] = "compute";
	char number[10];
	char line[10];

	printf\("Addresses of each string\n"\);
	printf\("word address = %u\n", &word\);
	printf\("stuff address = %u\n", &stuff\);
	printf\("number address = %u\n", &number\);
	printf\("line address = %u\n", &line\);
	printf\("\n"\);

	printf\("output a string \n"\);
	printf\("word is %s\n", word\);
	printf\("\n"\);

	printf\("prompt and input a string \n"\);
	printf\("Enter a word "\);
	scanf\("%s", line\);
	printf\("\n"\);
			
	printf\("demonstrate strlen \n"\);
	printf\("%s has %i letters\n", line, strlen\(line\)\);
	printf\("\n"\);
	
	printf\("concatenate word onto end of line \(enough space?\)\n"\);
	strcat\(line, word\);
	printf\("line after concatenation is %s\n", line\);
	printf\("word is unaffected: %s\n", word\);
	printf\("\n"\);

	printf\("concatenate word onto end of stuff \(not enough room!\) \n"\);
	strcat\(stuff, word\);
	printf\("word = %s\n", word\);
	printf\("stuff = %s\n", stuff\);
	printf\("line = %s\n", line\);
	printf\("\n"\);
	
	printf\("copy line into stuff\n "\);
	printf\("Before copy, stuff contains %s\n", stuff\);
	strcpy\(stuff, line\);
	printf\("after copy, stuff contains %s\n", stuff\);
	printf\("\n"\);
	
	printf\("demonstrate atoi\n"\);
	printf\("enter an integer: "\);
	scanf\("%s", number\);
	printf\("you entered %i\n", atoi\(number\)\);	

	return 0;
}