abs(), labs(), llabs() functions in C/C++

Difficulty Level : Basic
Last Updated : 26 Apr, 2018

abs(), labs(), llabs() functions are defined in cstdlib header file. These functions return the absolute value of integer that is input to them as their argument.

abs() function: Input to this function is value of type int in C and value of type int, long int or long long int in C++. In C output is of int type and in C++ the output has same data type as input.
Below is the sample C++ program to show working of abs() function.

// CPP program to illustrate 
// abs() function 
#include <cstdlib> 
#include <iostream> 
  
using namespace std; 
  
int main() 
{ 
    int val1, val2; 
  
    /// finding absolute value using 
    /// abs() function. 
    val1 = abs(22); 
    val2 = abs(-43); 
  
    cout << "abs(22) = " << val1 << "\n"; 
    cout << "abs(-43) = " << val2 << "\n"; 
    return 0; 
} 

Output: 
abs(22) = 22
abs(-43) = 43

labs() function: This is the long int version of abs() function. Both the input and output are of long int type.
Below is the sample C++ program to show working of labs() function.

// CPP program to illustrate 
// labs() function 
#include <cstdlib> 
#include <iostream> 
  
using namespace std; 
  
int main() 
{ 
    int val1, val2; 
  
    /// finding absolute value using 
    /// labs() function. 
    val1 = labs(1234355L); 
    val2 = labs(-4325600L); 
  
    cout << "labs(1234355L) = " << val1 << "\n"; 
    cout << "labs(-4325600L) = " << val2 << "\n"; 
    return 0; 
} 

Output: 
labs(1234355L) = 1234355
labs(-4325600L) = 4325600

llabs() function: This is the long long int version of abs() function. Both the input and output are of long long int type.
Below is the sample C++ program to show working of llabs() function.

// CPP program to illustrate 
// llabs() function 
#include <cstdlib> 
#include <iostream> 
  
using namespace std; 
  
int main() 
{ 
    int val1, val2; 
  
    /// finding absolute value using 
    /// labs() function. 
    val1 = llabs(1234863551LL); 
    val2 = llabs(-432592160LL); 
  
    cout << "llabs(1234863551LL) = " << val1 << "\n"; 
    cout << "llabs(-432592160LL) = " << val2 << "\n"; 
    return 0; 
} 

Output: 
llabs(1234863551LL) = 1234863551
llabs(-432592160LL) = 432592160

Rated as one of the most sought after skills in the industry, own the basics of coding with our C++ STL Course and master the very concepts by intense problem-solving.

My Personal Notes

Related Articles