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C Exercises: Return the absolute value of an integer

C Variable Type : Exercise-16 with Solution

Write a C program to return the absolute value of an integer.

Sample Solution:

C Code:

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

int main ()
	{
		int num;
		printf("\n Input a positive or negative number :");
		scanf("%d",&num);
		printf (" The absolute value of the given number is : %d\n\n",abs(num));
		return 0;
	}

Sample Output:

 Input a positive or negative number :-25                                                                     
 The absolute value of the given number is : 25 

Flowchart:

C Exercises Flowchart: Set a function that will be executed on termination of a program

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C Programming: Tips of the Day

How I can print to stderr in C?

The syntax is almost the same as printf. With printf you give the string format and its contents i.e.:

printf("my %s has %d chars\n", "string format", 30);

With fprintf it is the same, except now you are also specifying the place to print to:

File *myFile;
...
fprintf( myFile, "my %s has %d chars\n", "string format", 30);

Or in your case:

fprintf( stderr, "my %s has %d chars\n", "string format", 30);

Ref : https://bit.ly/3v5U8Zq