How to use sign function in c language

The sign function in C language is used to get the sign of a floating point value and returns an integer representing positive, negative or zero. Syntax: sign(double x), the parameter is a floating point value x. Return value: 1 if x is greater than 0, -1 if less than 0, 0 if x is equal to 0.

Usage of sign function in C language

What is sign function?

The sign function is used to get the sign of a value. It returns an integer indicating whether the value is positive, negative, or zero.

Syntax:

<code class="c">int sign(double x);</code>

Parameters:

• x: To get the float of the symbol pip value.

Return value:

• If x is greater than 0, return 1.
• If x is less than 0, return -1.
• If x is equal to 0, return 0.

Example:

<code class="c">#include <stdio.h>

int main() {
    double x = 5.0;
    int result = sign(x);

    printf("符号：%d\n", result);  // 输出：1

    return 0;
}</code>

Note:

• sign function is only valid for floating point values .
• The behavior is undefined if the argument passed to the sign function is not a floating point value.
• The integer value returned by the sign function cannot be directly confused with a boolean value because their ranges are different.

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