You know very, very old technology,” Kelly said Tuesday. “So many of our Departments of Labor across the country are still on the COBOL system. Now, in 2020, governments and banks are pleading for COBOL programmers, the language that wouldn’t die. By the 80’s, students were being told that COBOL was a dead language, and no one was studying it any more. īoth external and internal subroutines can receive the information through arguments.Once upon a time, when the world and computers were new, I was in an Associate’s Degree program for Data Processing-there were no “computer science” programs then-in which I had to study accounting, math, statistics, and three computer languages: IBM/360 Basic Assembly Language, FORTRAN, and COBOL.Internal subroutines can share the variables used by main exec where as external subroutines cannot. Internal subroutines are coded with in the current exec and external subroutines are coded outside the exec and are accessible by other execs as well. The subroutines are broadly classified as internal and external subroutines. * CALL AS INTERNAL USER-DEFINED FUNCTION */Ī Subroutine is used as a common structure when the sequence of instructions is repeatedly used in a main program, which results in ease of use and understanding.
SAY 'PERIMETER IS : ' RESULT /* DISPLAYED AS 20 */ * from a subroutine and displays that value. * This exec receives the maximum value between two numbers */ Example of passing information in a variable The variables NUM1, NUM2, and ANS are shared across internal subroutine and the calling exec. In the following example, the value of ANS is assigned in the subroutine and displayed in the main part of the exec. When an exec and its internal routine share the same variables, the value of a variable is what was last assigned, regardless of whether the assignment was in the main part of the exec or in the internal routine. Here routine refers to both subroutines and functions Call by Variable: However, external routines, however, cannot share the same variables, and information must pass between them through arguments or some other external way, such as data stack.
Arguments can also be used to pass information to and from an internal routine. As a result, commonly shared variables can be used to pass information between calling exec and internal routine. Passing Arguments across Subroutine / Function Calls:Īn internal routine can share variables with its caller.
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