Fundamentals Overview IDE (Editor) Syntax Variables Data Types Declarations Scope Operators

Standard Functions Arithmetic Trigonometry Strings Arrays Date/Time Flow Control Procedures Printing Files Folders

Additional Capabilities Keyboard Sound Graphics Concepts Screen (text) Screen (drawing) Gaming (sprites) Event Trapping Errors System Calls

Arithmetic Functions Summary
As languages go, QBasic provides relatively few arithmetic functions. Example usage of each function is provided below, but as you can see the functions are very simple to use. The arithmetic functions can be categorized roughly into four areas:

Trigonometry

cos, sin, tan, atn

Radians

The cos/sin/tan functions require an argument expressed in radians. The conversion factor is 1 radian = 57.2957795 degrees.

A full circle is 360 degrees, which is 2*pi = 2 * 3.14159 or about 6.28 radians. 180 degrees = 3.14 radians, 90 degrees = 1.57 radians, 45 degrees = 0.7854 radians

Trigonometric Function Reference
Here's a quick reference of the available trigonometric functions, in alphabetical order. The functions are very simple to use, but be sure to enter the angles in radians.

• atn - arctangent of numeric expression

      result = atn (42)         # returns 1.546991
      

• cos - cosine of angle (in radians)

      result = cos (45)         # returns 0.525322
      

• sin - sine of angle (in radians)

      result = sin (45)         # returns 0.850935
      

• tan - tangent of angle (in radians)

      result = tan (45)         # returns 1.619775