Question

Demonstrate, with a program, if this is true or false

:Scope is the portion of a program that can refer to an entity by its simple name

Answer 1

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It is true : Scope is the portion of a program that can refer to an entity by its simple name

A scope is a region of the program, and the scope of variables refers to the area of the program where the variables can be accessed after its declaration

Let's explain Local Scope , Global Scope with. Example so that you can understand more

Locol Scope: A local scope or block is collective program statements put in and declared within a function or block (a specific region enclosed with curly braces) and variables lying inside such blocks are termed as local variables. All these locally scoped statements are written and enclosed within left ({) and right braces (}) curly braces. There's a provision for nested blocks also in C which means there can be a block or a function within another block or function. So it can be said that variable(s) that are declared within a block can be accessed within that specific block and all other inner blocks of that block, but those variables cannot be accessed outside the block.

Example:

#include <stdio.h>
 
int main () {

  /* local variable declaration */
  int a, b;
  int c;
 
  /* actual initialization */
  a = 10;
  b = 20;
  c = a + b;
 
  printf ("value of a = %d, b = %d and c = %d\n", a, b, c);
 
  return 0;
}

Global Scope:

Global scope (and by extension global data storage) occurs when a variable is defined “outside of a function”. When compiling the program it creates the storage area for the variable within the program’s data area as part of the object code. The object code has a machine code piece, a data area, and linker resolution instructions. Because the variable has global scope it is available to all of the functions within your source code. It can even be made available to functions in other object modules that will be linked to your code; however, we will forgo that explanation now. A key wording change should be learned at this point. Although the variable has global scope, technically it is available only from the point of definition to the end of the program source code. That is why most variables with global scope are placed near the top of the source code before any functions. This way they are available to all of the functions.

#include <stdio.h>
 
/* global variable declaration */
int g = 20;
 
int main () {

  /* local variable declaration */
  int g = 10;
 
  printf ("value of g = %d\n",  g);
 
  return 0;
}

Output- 10