ACOS - Arccosine

The ACOS function returns a numeric value in radians that approximates the arccosine of argument-1.
The type of this function is numeric.

Format

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FUNCTION ACOS (argument-1)

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Arguments

1. argument-1 must be class "numeric".

2. The value of argument-1 must be greater than or equal to -1 and less than or equal to +1.

Returned values

1. The returned value is the approximation of the arc cosine of argument-1 and is greater than or equal to zero and less than or equal to pi.

2. The error default value is -2.

See also:        COS, SIN, ASIN, TAN, ATAN

Example 9-1

...
DATA DIVISION.
WORKING-STORAGE SECTION.
01  AS PIC S9V999 VALUE -0.25.
01  R PIC 9V99.
01  RES PIC +9.99.
PROCEDURE DIVISION.
P1 SECTION.
MAIN.
    COMPUTE R = FUNCTION ACOS (AS).
    MOVE R TO RES.
    DISPLAY RES UPON T.
    STOP RUN.

Result:               +1.82