What does sign mean in c language?

The sign operator in C language is used to return the sign of an integer: positive number (1), zero (0) or negative number (-1). The syntax is int sign(int x), and the return value is: 1 for positive numbers, 0 for zero, and -1 for negative numbers.

The meaning of sign in C language

In C language, sign is an operator that returns The sign of an integer: positive (1), zero (0), or negative (-1).

Syntax

int sign(int x);

Parameters

• x: The integer expression to determine the symbol .

Return value

• If x is a positive number, return 1.
• If x is zero, return 0.
• If x is negative, return -1.

Example

#include <stdio.h>

int main() {
  int num = -10;
  int result = sign(num);

  printf("符号为：%d\n", result);

  return 0;
}

Output:

<code>符号为：-1</code>

Application

sign operator is mainly used Used for comparing and sorting, and determining the sign of a number. For example, it can be used to:

• Determine whether two numbers have the same sign (sign(x) == sign(y)).
• Sort a set of numbers based on absolute value (use abs(x) * sign(x)).
• Check whether a number is positive (sign(x) > 0).

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