C Programming Absolute Beginner's Guide (3rd Edition)

Note

Maybe you’re wondering why the conditional operator is ?:, but the question mark

and colon never appear next to each other. Well, that’s just the way it is. It would be

too cumbersome to go around saying that the conditional operator looks like a question

mark and a colon with some stuff in between.

Here’s a short program that uses the conditional operator. (Actually, it uses it eight times!) The
program prompts the user for an integer and then tests whether the number is divisible by all single-
digit numbers between 2 and 9:

Click here to view code image

// Example program #1 from Chapter 13 of Absolute Beginner's Guide

// to C, 3rd Edition

// File Chapter13ex1.c

/* This program asks for a number from 1 to 100 and tells then

whether or not their choice is equally divisible by 2 through 9. */

#include <stdio.h>

main()

{

// Define the integer to hold the user's guess and then get it

// from the user

int numPick;

printf("Pick an integer between 1 and 100 ");

printf("(The higher the better!)\n");

scanf(" %d", &numPick); //remember for an int, you do need the &

printf("%d %s divisible by 2.", numPick, (numPick % 2 == 0)? ("is")

: ("is not"));

printf("\n%d %s divisible by 3.", numPick, (numPick % 3 == 0)?

("is") : ("is not"));

printf("\n%d %s divisible by 4.", numPick, (numPick % 4 == 0)?

("is") : ("is not"));

printf("\n%d %s divisible by 5.", numPick, (numPick % 5 == 0)?

("is") : ("is not"));

printf("\n%d %s divisible by 6.", numPick, (numPick % 6 == 0)?

("is") : ("is not"));

printf("\n%d %s divisible by 7.", numPick, (numPick % 7 == 0)?

("is") : ("is not"));

printf("\n%d %s divisible by 8.", numPick, (numPick % 8 == 0)?

("is") : ("is not"));

printf("\n%d %s divisible by 9.", numPick, (numPick % 9 == 0)?

("is") : ("is not"));

return 0;

}