C cos() function
C cos() function - arc cosine functions
Syntax:
double cos(double x)
The cos() function is used to calculate the cosine of x. The value x is expressed in radians. If x is too large, a partial loss of significance in the result might occur.
Parameters:
Name | Description | Required /Optional |
---|---|---|
x | Represent an angle expressed in radians. | Required |
Return value from cos()
- The function returns the cosine of x.
Example: cos() function
The following example shows the usage of cos() function.
#include <math.h>
#include <stdio.h>
int main(void)
{
double x, y;
x = 0;
y = cos(x);
printf("cos( %lf ) = %lf\n", x, y);
x = 1;
y = cos(x);
printf("\ncos( %lf ) = %lf\n", x, y);
x = 45;
y = cos(x);
printf("\ncos( %lf ) = %lf\n", x, y);
}
Output:
cos( 0.000000 ) = 1.000000 cos( 1.000000 ) = 0.540302 cos( 45.000000 ) = 0.525322
C Programming Code Editor:
Previous C Programming: C atan2()
Next C Programming: C cosh()
C Programming: Tips of the Day
What's the point of const pointers?
const is a tool which you should use in pursuit of a very important C++ concept:
Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.
Even though it does not change the functionality, adding const generates a compiler error when you're doing things you didn't mean to do. Imagine the following typo:
void foo(int* ptr) { ptr = 0;// oops, I meant *ptr = 0 }
If you use int* const, this would generate a compiler error because you're changing the value to ptr. Adding restrictions via syntax is a good thing in general. Just don't take it too far -- the example you gave is a case where most people don't bother using const.
Ref : https://bit.ly/33Cdn3Q
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