Math Functions

Several kinds of functions are available in C++. For the time being we will use a group of predefined functions. These are programs that are supplied with most C++ compilers. The header file that must be included for math functions is

. The predefined functions when used in a C++ statement, the argument is enclosed in parentheses following the name of the function. Table 2.4 below shows some of the math functions that you can use. Confusion could result if a variable were defined with the same name as that of a predefined function. Therefore, good practice dictates that names of variables should not be chosen to be the same as the predefined functions.

 

 

Name Meaning

abs( ) Absolute value

sqrt( ) Square root

log( ) Logarithm to the base e=2.71828

log10 ( ) Logarithm to the base 10

exp( ) Power of e or exponential

sin( ) Sine of the angle whose measure is given in radians

cos( ) Cosine the angle whose measure is given in radians

tan( ) Tangent of the angle whose measure is given in radians

atan( ) Arctagnget or principal angle in radians of a given value

acos( ) Arccosine

asin( ) Arcsine

ceil( ) Rounds numbers up to nearest integer

floor( ) Rounds numbers down to the nearest integer

pow(x,y) x^y