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C Programming in VS Code

Printing a message in C

Beginner's Guide to Keywords, Identifiers, Constants, Variables, Datatypes in C

Operators & Expressions in C

Input & Output Operations in C

Control Statements in C

Loops in C

Array in C

Character Array & Strings in C

User Defined Functions in C

Structure and Union in C

Pointers in C

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Beginner's Guide to Keywords, Identifiers, Constants, Variables, Datatypes in C

Keywords: A keyword in C is a word that is reserved by the programming language and has a specific meaning and use in the language.

Identifiers: In C, an identifier is a name given to a variable, function, or any other user-defined item. It must begin with a letter or underscore and consist of only letters, digits, and underscores.

Constants: In C, a constant is a value that cannot be modified during the execution of a program. Constants are defined using the keyword "const" and can be of various data types. They are also called literals.

Variables: A variable in C is a named storage location used to hold data values. Variables must be declared with a specific data type and can be assigned a value during or after declaration.

Datatypes: In C, the datatype is a keyword that defines the type and size of a variable or function's input or output. Examples include int, float, char, etc. Each datatype has a specific memory size and range of values.

Overflow: In C, overflow occurs when a variable's value exceeds its maximum storage limit, causing the value to wrap around to the minimum limit. This can lead to unexpected results and can be a source of bugs.

Underflow: In C, underflow occurs when a variable's value is below its minimum limit, resulting in a loss of precision or even undefined behaviour. It's a condition of arithmetic operation results having a smaller absolute value than the smallest representable value.

Beginner's Guide to Keywords, Identifiers, Constants, Variables, Datatypes in C

Program to take input from keyboard:

take_input_from_keyword.c


#include <stdio.h>

void main() 
{
    int x;
    printf("Enter a number: ");
    scanf("%d", &x);
    printf("\nYou have entered: %d", x);
}