C Compare Function: Purpose & Usage

In the C language, the compare function is commonly used to determine the size or relationship between two values. This function can be used to check if two values are equal, or determine if one is greater than, less than, or equal to the other. The compare function typically returns an integer value indicating the result of the comparison, often being -1 (less than), 0 (equal), or 1 (greater than). For example, the strcmp function is used to compare the size relationship between two strings. Compare functions are frequently utilized in sorting, searching, and other algorithms.