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Declaration & Defination

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What is the declaration in C? In programming, a declaration is a statement that describes an identifier, such as the name of a variable or a function.  For example, in the C programming language, all variables must be declared with a specific data type before they can be assigned a value. In the Declaration of variable, the type of variable is to be specified. There are different data types in C like int, char, float. So that compiler can understand which type of data we want to store. For a variable, declaration means just stating its data type along with giving it a name for memory allocation but does not allocate memory. Declaration declares an identifier and its type. In other words a function declaration declares the name of the function and the return type. Memory is not allocated at the time of declaration. What is the definition? While definition means giving the value of that variable The definition of a variable says where the variable gets st...
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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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