#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;
}