CODEWITHSUNDEEP
c
Daniel Wootton
Daniel Wootton

Reputation: 103

Using a function to convert angles from degrees to radians in C

As part of a wider project I am given an angle in degrees that needs to be converted to radians for some calculation.

So far, I have the following:

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

feature1()
{
    double angle = 90.0000, angle2;
    angle2 = convert_to_rad(angle);
    printf("%lf", &angle);
}

double convert_to_rad(double angle_in_deg)
{
    double angle_in_rad;
    angle_in_rad = (angle_in_deg * M_PI) / 180;
    return angle_in_rad;
}

When compiling the file in NetBeans I get the following errors:

note: previous implicit declaration of 'convert_to_rad' was here.
error: conflicting types for 'convert_to_rad

Upvotes: 0

Views: 1844

Answers (1)

Ed Heal
Ed Heal

Reputation: 59987

Why not fix the formatting?

Anyhow use a forward declaration.

i.e. place

double convert_to_rad(double angle_in_deg);

At the start (before feature1 function)

Upvotes: 7

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