Question

How to use tan() function to compute the tangent of an angle of N radians in C

Answer 1

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

#define PI 3.14159265
 
int main(int argc, char **argv)
{   
	printf("tan(45 * PI / 180.0) = %f\n", tan(45 * PI / 180.0));
    printf("tan(3 * PI / 4) = %f\n", tan(3 * PI / 4)); 
    printf("tan(5 * PI / 4) = %f\n", tan(5 * PI / 4)); 
    printf("tan(7 * PI / 4) = %f\n", tan(7 * PI / 4)); 
	printf("tan(PI / 4) = %f\n", tan(PI / 4)); 
    printf("tan(0.0) = %f\n", tan(0.0));
    printf("tan(-0.0) = %f\n", tan(-0.0));
	
    return 0;
}
 
/*
run:
   
tan(45 * PI / 180.0) = 1.000000
tan(3 * PI / 4) = -1.000000
tan(5 * PI / 4) = 1.000000
tan(7 * PI / 4) = -1.000000
tan(PI / 4) = 1.000000
tan(0.0) = 0.000000
tan(-0.0) = -0.000000

*/

 

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