Extend your program by including procedures to add, subtract, multiply and divide 2 numbers entered by the user.Rewrite the example program to use a procedure to add up 2 numbers entered by the user.If this program were written to declare 2 variables to store integers (say c and d), and these variables were set to equal integers, the procedure call would be as follows, addupnums(c,d) Exercise Whether a variable is local or global is called the scope of the variable. Variables declared at the start of the program are called global variables because their values are retained across the program as a whole. This is called a local variable, because it only works within a specific part of the program. Once the procedure is finished, the variable is destroyed. This variable will only retain stored information whilst the procedure is being executed. Les rels doivent tre compris en TURBO entre + et 1.7E37 (c.a.d 1,7 fois 10 puissance 37), avec 11 chiffres significatifs. Dans tous les PASCALs on possde la variable prdclare MAXINT qui donne le plus grand entier admissible. Notice that, in this example, a variable, total is declared at the start of the procedure. En TURBO PASCAL, les entiers admissibles sont compris entre 32768 et +32767.

When the procedure is called in the main program, values have to be set for these parameters. Typed constants are a Turbo Pascal specialty Local data are the variables which the programmer declared in a procedure or function below the Procedure. In this example, a and b are called the parameters of the procedure. Free Pascal supports the same basic types as Turbo Pascal, with some extra types from Delphi. The procedure declaration is placed before the start of the main part of the program. In pascal, variables have specific data types that determine. When you have a series of instructions that need to be carried out more than once in your program, it saves time to write these instructions as a procedure. A variable is a unit of memory that stores information and can be manipulated by the computer.

Variables en turbo pascal