Lecture 1.5 Variables.pdf
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This document discusses variables in programming. It explains that variables are locations in memory where values can be stored, and common data types include integers, characters, and floating point numbers. Variables must be declared with a name and data type before use. Multiple variables can be declared in one statement separated by commas. Variable names correspond to locations in memory, and each variable has a name, type, size and value. When a new value is assigned to a variable, it overwrites the previous value stored there. The document also discusses using the input stream extraction operator (>>) to get user input and store it in a variable, and the assignment operator (=) to assign a value to a variable.
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Lecture 1.5 Variables.pdf
- 1. VARIABLES Lecture 1.5 Prepared by: Mian Saeed Akbar REF:
- 2. VARIABLES Variables Location in memory where value can be stored Common data types int - integer numbers char - characters double - floating point numbers Declare variables with name and data type before use int integer1; int integer2; int sum; Can declare several variables of same type in one declaration Comma-separated list int integer1, integer2, sum;
- 3. VARIABLES Variable names Correspond to actual locations in computer's memory Every variable has name, type, size and value When new value placed into variable, overwrites previous value std::cin >> integer1; Assume user entered 45 std::cin >> integer2; Assume user entered 72 sum = integer1 + integer2; integer1 45 integer1 45 integer2 72 integer1 45 integer2 72 sum 117
- 4. VARIABLES Input stream object o >> (stream extraction operator) Used with std::cin Waits for user to input value, then press Enter (Return) key Stores value in variable to right of operator Converts value to variable data type = (assignment operator) Assigns value to variable Binary operator (two operands) Example: sum = variable1 + variable2;
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