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Math library

This post lists the important functions available in the “math.h” library of C with their examples. Before continuing, you must know that we need to include the “math.h” library while compiling our program by using -lm ($cc -c filename.c  $cc -o filename filename.c -lm).
Function     Description                                 Example
sqrt(x)       square root of x                              sqrt(4.0) is 2.0
                                                                         sqrt(10.0) is 3.162278
exp(x)        exponential (ex)                            exp(1.0) is 2.718282
                                                                         exp(4.0) is 54.598150
log(x)        natural logarithm of x (base e)       log(2.0) is 0.693147
                                                                         log(4.0) is 1.386294
log10(x)     logarithm of x (base 10)                log10(10.0) is 1.0
                                                                         log10(100.0) is 2.0
fabs(x)        absolute value of x                       fabs(2.0) is 2.0
                                                                         fabs(-2.0) is 2.0
ceil(x)        rounds x to smallest integer not less than x 
                                                                        ceil(9.2) is 10.0
                                                                        ceil(-9.2) is -9.0
floor(x)       rounds x to largest integer not greater than x 
                                                                        floor(9.2) is 9.0
                                                                        floor(-9.2) is -10.0
pow(x,y)    x raised to power y (xy)                pow(2,2) is 4.0
fmod(x)     remainder of x/y as floating-point number 
                                                                        fmod(13.657, 2.333) is 1.992
sin(x)       sine of x (x in radian)                      sin(0.0) is 0.0
cos(x)      cosine of x (x in radian)                  cos(0.0) is 1.0
tan(x)       tangent of x (x in radian)                tan(0.0) is 0.0
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