Scope of variables
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This document discusses variables in C programming. It defines a variable as a name given to a storage area that can be manipulated by a program. Variables have specific types like char, int, float, and double that determine their size, range, and operations. Variables can be either local or global. Local variables are declared within a function and are only accessible within that function, while global variables are declared outside of functions and can be accessed anywhere in a program. The document encourages learning programming through online courses offered by Baabtra.
Scope of variables
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- 3. Syed Maharoof thangal c mahroof917@@gmail.com www.facebook.com/syed mahroof twitter.com/syed mahroof in.linkedin.com/in/syed mahroof
- 4. A variable is nothing but a name given to a storage area that our program can manipulate. Each variable in C has a specific type, ◦ Size and layout ◦ Range ◦ Set of operations
- 5. Char Int Flaot Double void
- 6. An objective C program will consist of code divided up into functions, classes , and code structures A typical program will make extensive use of variable to store and manipulate data Once a variable declared it may or may not be accessible to other section of program code This accessibility depends on where and how the variable was declared and where the code is that needed to access .This is known as variable scope
- 7. Local Variables Global variables
- 8. Variable that are declared inside a function or block called local variables They can be used only by statements that are inside that function or block of code Local variable not known to functions outside
- 9. Here all the variables x , y and z are declared inside the main , so it is local to main() functions
- 10. Global variables are defined outside of a function , usually on top of the program The global variables will hold their value throughout the lifetime of your program and they can be accessed inside any functions defined for the program A global variable can be accessed by any function Global variable is available for use throughout your entire program after its declaration
- 12. A program can have same name for local and global variables But value of local variables inside a function will take preference
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