Absolute Value In C

[htdefiant 0]

Hey,
I'm writing a program for a friend in Calculus. The goal is for him to be able to input a number, and have the computer return whether it is positive or negative, and its absolute value. Here is what I have so far:

printf("Please enter a number linenums:0'>/* positive.cpp* The program that gets a number and checks if it is a positive number.*It prints an appropriate message indicating if its positive or negative and also prints the*absolute value of the number.*/#include <stdio.h>#include "genlib.h"#include "simpio.h"main (){ int num1; bool positive; printf("This program will determine if the user inputted number is positive or negative. \n"); printf("It will also display the number's absolute value. \n"); printf("Please enter a number: \n"); num1=GetInteger (); if (num1==0) printf("The number %d is neither positive nor negative. \n", num1);else if (num1>0) { printf("The number %d is positive and its absolute value is %d. \n", num1, num1); positive=true; } else { printf("The number %d is negative and its absolute value is %d. \n", num1, num1); positive=false; } getchar (); return 0; }
Obviously the line

printf("The number %d is negative and its absolute value is %d. \n", num1, num1);

is flawed. How do I fix it so if the number is negative it will display the correct absolute value?

Thank you.

[Tetraca 0]

A function would be what you are looking for. I'm sure there's one in the standard library for it called abs which will change it to an absolute number.

[htdefiant 0]

So what would the line be? Yes, there is a function called abs.Something like this:printf("The number %d is negative and its absolute value is %d. \n", num1, abs:num1);?

[fffanatics 0]

The correct syntax for that line would be:printf("The number %d is negative and its absolute value is %d. \n", num1, abs(num1));also if you wanted to get the absolute value of a floating point number instead you can use fabs(variable).

[htdefiant 0]

Thanks, it worked great.