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In programming, variables are named storage locations that hold data values. These values can change during the execution of a program, making variables essential for storing and manipulating data. Variables can be categorized into different types based on their scope, lifetime, and usage.
Global Variables
Global variables are declared outside any function or block and are accessible throughout the entire codebase. They can be accessed from any part of the program, including functions, blocks, or modules. Here is an example in C++:
#include <iostream>using namespace std;int globalVariable = 5;void gfgFnc() {cout << globalVariable << endl;}int main() {cout << globalVariable << endl;gfgFnc();return 0;}Output:
55Local Variables
Local variables are declared within a specific function, block, or scope and are only accessible within that limited context. They cannot be directly accessed outside that scope. Here is an example in C++:
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