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Identifiers

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What is identifier ?       In C language identifiers are the names given to variables, constants, functions, and user-defined data. An identifier or name is a sequence of characters invented by the programmer to identify or name a specific object. Rules for identifiers:- The first character must be an alphabet or underscore. All characters must be alphabetic characters, digit or underscores. Only the first 31 characters are significant. You can not use a keyword. Must not contain white space. Identifiers names must be unique.   Some examples:- people_number monthly_pay tool_4 box_4_weight maths_2_sum  When we declare a variable or any function in C language program, to use it we must provide a name to it, which identified it throughout the program. example:-            int sum_1 = "que1" ; Here,  sum_1 is name or identifiers for the variable which store the value "que1" in it. ...
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Getting input in C

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                 Getting input in C There are two ways to get input from user in C language. 1) By scanf() function 2) By gets() or fgets() function 1. By scanf() function:-            The standard input-output header file named stdio.h   contains the definition of the function printf()   and scanf(), which are used to display on the screen and to take input from user. Program:-   #include < stdio . h > void main ( ) { // defining a variable int x ; /* displaying message on the screen asking the user to input a value */ printf ( "Please enter a value..." ) ; /* reading the value entered by the user */ scanf ( "%d" , &x ) ; /* displaying the number as output */ printf ( "\nYou entered: %d" , x ) ; } Output:- Please enter a value... The Output was aski...
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Unary Operator

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What is a Unary Operator? Unary Operators are the operators which require only one operand. While binary operator requires two operands and tertiary requires three operands. Unary operators are: +, -, ++, --, sizeof() 1) + and -   Note: (+) and (-) are not of addition and subtraction but it denotes only sign of operator as positive or negative. Ex. +1, +2, +3... -1, -2, -3... 2) ++ and -- It seems to be  ++ (two plus-plus), But it is a single operator. It is called the increment operator . Increment operator are of two type: i) Pre increment ii) Post increment The meaning of both the increments is the same. i.e To add +1 in  any value x++ or ++x; or to increase the value by 1. x++ is x=x+1 where x is a variable. Example: 7++ output is 8 25++ output is 26 program: (Pre-increment)  #include <stdio.h> #include <conio.h> int main() {     int x=7;     ++x;  / /Whe...
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