Variable declaration variables are place holders for

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Variable Declaration Variables are place holders for data a program might use or manipulate. Variables are given names so that we can assign values to them and refer to them later to read the values. Variables typically store values of a given type . Types generally include: Integer – to store integer or “whole” numbers Real – to store real or fractional numbers (also called float to indicate a floating point number) Character – A single character such as a letter of the alphabet or punctuation. String – A collection of characters In order to use a variable within a program, the compiler needs to know in advance the type of data that will be stored in it. For this reason, we declare the variables at the start of the program. Variable declaration consists of giving a new name and a data type for the variable. This is normally done at the very start of the program. In the following example programs, variables of different types are declared and used in the programs. Language Example program “C” #include <stdio.h> void main() { int age; float salary; char middle_initial; age = 21; salary = 29521.12; middle_initial = "K"; printf("I am %d years old ", age);
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printf("I make %f8.2 per year " salary); printf("My middle initial is %c ", middle_initial); } Pascal program myexample (output); var age: integer; salary: real; middle_initial: char; begin age := 21; salary := 29521.12; middle_initial := 'K'; writeln('I am ', age, ' years old'); writeln('I make ', salary, ' per year'); writeln('My middle initial is ', middle_initial); end. Oracle PL/SQL CREATE OR REPLACE PROCEDURE myexample AS age NUMBER; salary NUMBER; middle_initial CHAR(1); BEGIN age := 21; salary := 29521.12; middle_initial := 'K'; DBMS_OUTPUT.PUT_LINE('I am ' || age || ' years old'); DBMS_OUTPUT.PUT_LINE('I make ' || TO_CHAR(salary, '99999.99') || ' per year'); DBMS_OUTPUT.PUT_LINE('My middle initial is ' ||
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