Question

How to use atan2() function to get the arc tangent value of y/x in C

Answer 1

#include <stdio.h>     
#include <math.h>
  
int main(int argc, char **argv)
{
    printf("atan2(1, 1) = %.6f\n", atan2(1, 1));
	printf("atan2(1, -1) = %.6f\n", atan2(1, -1));
	printf("atan2(-1, 1) = %.6f\n", atan2(-1, 1));
	printf("atan2(-1, -1) = %.6f\n", atan2(-1, -1));
 
    return 0;
}
  
/*
run:
  
atan2(1, 1) = 0.785398
atan2(1, -1) = 2.356194
atan2(-1, 1) = -0.785398
atan2(-1, -1) = -2.356194
 
*/

 

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