Solution for Exercise 8-15

ex0815

#include <stdio.h>

int main()
{
    int coordinate;

    printf("Input target coordinate: ");
    scanf("%d",&coordinate);
    if( coordinate < -5 || coordinate > 5 )
    {
        puts("Close enough!");
    }
    else
    {
        puts("Target is out of range!");
    }
    return(0);
}

Notes

* The easiest way to construct the comparison in Line 9 is to read the directions from the book: "...make the condition true when the value of variable coordinate is less than -5 or greater than 5." Now look at Line 9:

if( coordinate < -5 || coordinate > 5 )

That statement reads, "If the value of variable coordinate is less than -5 or the value of variable coordinate is greater than 5." Or, to be brief about it, "If coordinate is less than -5 or coordinate is greater than 5." Or:

if( coordinate < -5 || coordinate > 5 )

* As long as you read the <, ||, and > symbols properly, you can get the comparison correct.

Exercise ex0816 →