Built-In Function of Math: The functions that are used to perform mathematical calculations are defined in “math.h” header file. The commonly used math library functions are discussed below. The “pow” Function: It is used to calculate the exponential power of a given integer number. Its syntax is: pow (x ,y); Where x : is an integer number whose power is to be calculated. y : is an integer... 

Built-In Functions of String: The “string.h” header file contains the functions that are used to process strings. The commonly used functions of this header file are given below. The “strlen” Function: The “strlen” stands for string length. This function is used to find the length of a string. It counts the total number of characters including spaces. Null character is excluded. Its syntax...