C atan2() function
C atan2() function - Calculate Arctangent
Syntax:
double atan2(double y, double x)
The atan2() function is used to calculate the arctangent of y/x.
Parameters:
Name | Description | Required /Optional |
---|---|---|
x | Represent x-coordinate. | Required |
y | Represent y-coordinate. | Required |
Return value from atan2()
- Returns a value in the range -π to π radians.
- Returns a value of 0 if both arguments of the atan2() function are zero.
Example: atan2() function
The following example shows the usage of atan2() function.
#include <stdio.h>
#include <math.h>
int main(void)
{
double x, y, z;
x = 0.45;
y = 0.23;
z = atan2(x,y);
printf("atan2( %lf, %lf ) = %lf", x, y, z);
}
Output:
atan2( 0.450000, 0.230000 ) = 1.098299
C Programming Code Editor:
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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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