math.h in c

math.h

sizeof()

abort()

fmod()

modf()

atoi()

sqrt()

scanf

pow()

log()

atan()

asin()

atan()

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atan() in c

atan Arc cosine, arc sine, and arc tangent functions
Declaration:
Real:
double atan(double x);
double atan2(double y, double x);
Remarks:
atan and atanl calculate the arc tangent of the input value
atan2 and atan2l also calculate the arc tangent of the input value
Return Value:
atan and atanl return the arc tangent of the input value (in the range -pi/2 to pi/2)
atan2 and atan2l return the arc tangent of y/x (in the range -pi to pi).

Program

#include <stdio.h> #include <math.h> int main(void) {    double result;    double x = 0.5;    result = atan(x);    printf("The arc tangent of %lf is %lf\n", x, result);    return(0); }

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