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Abs

Defined in headers <cstdlib>, <cinttypes>, <cmath>.

Description

Computes the absolute value of an integer number. The behavior is undefined if the result cannot be represented by the return type.

Declarations

Defined in <cstdlib>
// 1)
int abs (int n);
// 2)
long int abs (long int n);
// 3)
constexpr long long int abs (long long int n);
// 4)
constexpr long labs( long n );
// 5)
constexpr long long llabs( long long n );
// 6)
constexpr /* floating-point-type */
abs( /* floating-point-type */ n );
Defined in <cmath>
// 7)
constexpr /* floating-point-type */
fabs ( /* floating-point-type */ n );
// 8)
constexpr float fabsf( float n );
// 9)
constexpr long double fabsl( long double n );
Defined in <cinttypes>
// 10)
std::intmax_t abs( std::intmax_t n );
// 11)
std::intmax_t imaxabs( std::intmax_t n );
Additional Overloads
// 16)
template< class Integer >
constexpr double fabs ( Integer n );

Parameters

n - Integral value.

Return Value

The absolute value of n.

Examples

Here we find the absolute values of the negatives 5 and 2371041 using the abs function from cstdlib.

#include <iostream>
#include <cstdlib>

int main() {

std::cout << "Abs value of -5: "
<< abs(-5);
std::cout << "Abs value of -2371041: "
<< abs(-2371041);

return 0;
}
Result
Abs value of -5: 5
Abs value of -2371041: 2371041
uwaga

No-throw guarantee: this function throws no exceptions.

If the result cannot be represented by the returned type (such as abs(INT_MIN) in an implementation with two's complement signed values), it causes undefined behavior.

Abs

Defined in headers <cstdlib>, <cinttypes>, <cmath>.

Description

Computes the absolute value of an integer number. The behavior is undefined if the result cannot be represented by the return type.

Declarations

Defined in <cstdlib>
// 1)
int abs (int n);
// 2)
long int abs (long int n);
// 3)
constexpr long long int abs (long long int n);
// 4)
constexpr long labs( long n );
// 5)
constexpr long long llabs( long long n );
// 6)
constexpr /* floating-point-type */
abs( /* floating-point-type */ n );
Defined in <cmath>
// 7)
constexpr /* floating-point-type */
fabs ( /* floating-point-type */ n );
// 8)
constexpr float fabsf( float n );
// 9)
constexpr long double fabsl( long double n );
Defined in <cinttypes>
// 10)
std::intmax_t abs( std::intmax_t n );
// 11)
std::intmax_t imaxabs( std::intmax_t n );
Additional Overloads
// 16)
template< class Integer >
constexpr double fabs ( Integer n );

Parameters

n - Integral value.

Return Value

The absolute value of n.

Examples

Here we find the absolute values of the negatives 5 and 2371041 using the abs function from cstdlib.

#include <iostream>
#include <cstdlib>

int main() {

std::cout << "Abs value of -5: "
<< abs(-5);
std::cout << "Abs value of -2371041: "
<< abs(-2371041);

return 0;
}
Result
Abs value of -5: 5
Abs value of -2371041: 2371041
uwaga

No-throw guarantee: this function throws no exceptions.

If the result cannot be represented by the returned type (such as abs(INT_MIN) in an implementation with two's complement signed values), it causes undefined behavior.