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#1
 
 
The atan2() function of C++ I am the studying in the BSCIT. I can have the good knowledge of the C++ language. But I can not have much more knowledge about the builtin functions of C++ language. So, I want to know about the atan2() function of the C++ language. I also want to know about how can I use the atan2() function in the C++ programming language. Thus, Can anyone has the proper answer on the atan2() function in the C++ language. Reply Me!!! 
#2
 
 
Re: The atan2() function of C++ The atan2() function of the C++ language can be used to compute an arc of a tangent with two arguments. The atan2() function can returns the principal value of an arc tangent of q/p that can be an expressed in radians. To calculate the value, the function that can uses the sign of both an arguments to determine the quadrant. In C++ language, the atan2() function can be overloaded in the <valarray>. 
#3
 
 
Re: The atan2() function of C++ The atan2() function can compute an arc of the tangent with two arguments. The atan2() function of the C++ can returns the principal value of an arc of the tangent of b/a and that can be an expressed in radians. The following can be the general syntax of the atan2() function of the C++ language : Code: double atan2 ( double q, double p ); long double atan2 ( long double q, long double p ); float atan2 ( float q, float p ); 
#4
 
 
The atan2() function of C++ The following program could states you that how you can use the atan2() function in the C++ language coding while using the atan2() function in the coding as shown : Code: #include <stdio.h> #include <math.h> #define PI 3.14159265 int main () { double p, q, rslt; p = 10.0; q = 10.0; result = atan2 (q,p) * 180 / PI; printf ("The arc tangent for (p=%lf, q=%lf) is %lf degrees\n", p, q, rslt); return 0; } Code: The arc tangent for (p=10.000000, q=10.000000) is 135.000000 degrees. 
#5
 
 
Re: The atan2() function of C++ The atan2() function can calculates an arc of the tangent of q/p, by using the signs of an arguments to calculate the quadrant of the return value. The values that can be returned can be in the given specified range [pi, pi]. You have to noticed that an order of the given specified an arguments can be passed to the atan2() function. 
#6
 
 
Re: The atan2() function of C++ I can suggest you that to carefully go through the following code of lines that can demonstrates you how to use the atan2() function in the C++ programming as follows : Code: #include <math.h> #include <stdio.h> #include <errno.h> int main( int ac, char* av[] ) { double z1, z2, z; if( ac != 3 ) { fprintf( stderr, "Usage: %s <z1> <z2>\n", av[0] ); return; } z1 = atof( av[1] ); z = atan( z1 ); printf( "Arctangent of %f: %f\n", z1, z ); z2 = atof( av[2] ); z = atan2( z1, z2 ); printf( "Arctangent of %f / %f: %f\n", z1, z2, z ); } Code: Arctangent of 0.500000: 0.463648 Arctangent of 0.500000 / 5.000000: 0.099669 

Tags: atan2, cpp, functions, header files, library, valarray 
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