Question

How to use atan() function to compute the principal value of the arc tangent of N in C

Answer 1

#include <stdio.h>     
#include <math.h>

int main(int argc, char **argv)
{   
	printf("atan(1.0) = %f\n", atan(1.0));
	printf("atan(-1.0) = %f\n", atan(-1.0));	
	printf("atan(0.0) = %f\n", atan(0.0));
	printf("atan(-0.0) = %f\n", atan(-0.0));
	printf("atan(INFINITY) = %f\n", atan(INFINITY));
	
    return 0;
}
 
/*
run:
   
atan(1.0) = 0.785398
atan(-1.0) = -0.785398
atan(0.0) = 0.000000
atan(-0.0) = -0.000000
atan(INFINITY) = 1.570796

*/

 

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