C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast

Operators

What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

Looping

What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop

Functions

What is Function C User Defined Functions C Recursion C Passing Parameters

Scope

Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register

Array

What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings

String

What is String C String Functions

Pointer

What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer

Structure

What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def

Union

What is Union

Files

What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

Scope Resolution Operator In C

Scope Resolution operator tells the compiler to use global variable instead of local variable. A variable followed by scope Resolution operator must be initialized globally. Scope Resolution operator is represented by the symbol ::.

Scope Resolution Operator

Scope resolution operator program

Unfortunately, C programming doesn't support scope resolution operator. So by making using C Plus Plus with an extention .cpp to learn scope resolution operator for future use.

scoperesolution.c
#include <stdio.h> //header file section
int value();        // function declaration
int a = 7;          //variable a is declared globally
int main()
{
value();           //calling a function
return 0;
}
int value()
{
int a = 5;
printf("The value of a = %d ",a);
printf("\nThe value of a = %d ",::a);
return 0;
}
  • The value of a = 5
  • The value of a = 7

Note:

Here, the second printf tells the compiler to use global variable instead of local variable.

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