Math Functions In C

The <math.h> header file contains various methods for performing mathematical operations such as sqrt(), pow(), ceil(), floor() etc. They are

1)ceil(number)

 It returns the smallest integer value not less than the number specified as an argument

Example:

ceil(2.2536); //output 3

ceil(-2.2536); //output -2

2)floor(number)

It returns the largest integer value not greater than a number specified as an argument.

 Example:

floor (2.2536); //output 2

floor (-2.2536); //output –3

3)abs(number)

It returns the absolute value of a number.

Example:

abs (6); //output 6

abs (-6); //output 6

4)sqrt(n)
This function returns the non-negative square root of n

 Where n is the number.

Example:

Select sqrt(49)  // output is 7

5)pow(base, exponent)

These two functions return the value of  X  raised to the power of Y.

Example:

Select pow (3, 2); // output is 9(3*3)

Select pow (2, 4); // output is 16(2*2*2*2)

Example:

#include<stdio.h>  

#include <math.h>    

int main(){    

printf("\n%f",ceil(4.6));    

printf("\n%f",ceil(4.3));    

printf("\n%f",floor(3.6));    

printf("\n%f",floor(3.2));    

printf("\n%f",sqrt(64));    

printf("\n%f",sqrt(7));    

printf("\n%f",pow(2,4));    

printf("\n%f",pow(3,3));    

printf("\n%d",abs(-17));     

 return 0;    

}    

Output:

5.000000

5.000000

3.000000

3.000000

8.000000

2.645751

16.000000

27.000000

17