What is sin() in C?
The sin() function in C returns the sine of a number. To be more specific, it returns the sine of a number in the radians float value.
The illustration below shows the mathematical representation of the sin() function.
Note:
- The
math.hheader file is required for this function.- This
sin()function only works for right-angled triangles.
Syntax
double sin(double num)
Parameter
This function requires a number that represents an angle in radians as a parameter.
In order to convert degrees to radians, use the following formula:
radians = degrees * ( PI / 180.0 )
Return value
sin() returns the sine of a number (radians float value) that is sent as a parameter.
Example
#include<stdio.h>//header file#include<math.h>int main() {//positive number in radiansprintf("The sine of %lf is %lf \n", 2.3, sin(2.3));// negative number in radiansprintf("The sine of %lf is %lf \n", -2.3, sin(-2.3));//converting the degrees angle into radians and then applying sin()// degrees = 45.0// PI = 3.14159265// result first converts degrees to radians then apply sindouble result=sin(45.0 * (3.14159265 / 180.0));printf("The sine of %lf is %lf \n", 45.0, result);}
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