C Programming

Keywords: Keywords have fixed meanings and these meanings can not be changed. There are 32 keywords. Some compiler may use additional keywords that must be identified from the C manual. Keywords serve as basic building block for a program statement. Such as, auto, break, double etc. All keyword must be written in lowercase. Identifiers: The names of variables, functions … Read more

Character set: The various category of characters are called the character set. In C, the characters are grouped into the following categories. Letters: Uppercase     A………………Z Lowercase     a……………….z Digits: All decimal digits. 0…………….9 Special characters: such as,           comma.           period;           semicolon:           colon White spaces: Such as blank spaces, horizontal tab, new line etc.

What is a Constant? In C programming language and other languages, constants are variables with a exception that the value of a constant can be set only once and can not be modified later. This exception differs a constant variable from other variables and are called constant because their values are not variable. Value of … Read more

Information: After converting or processing the data which may consists of numbers, characters, strings etc to something which is useful and make much sense to a person is known as Information. So, information is the converted or processed form of data. Program: Program is a set of instructions. The task of processing of data is accomplished … Read more

The else if ladder : When a multipath decision is involved then we use else if ladder. A multipath decision is a chain of ifs in which the statement associated with each else is an if. It takes the following general form, This construct is known as the else if ladder. The conditions are evaluated from the top, downwards. This can be shown by … Read more

Nested if…else statement: When a series of decisions are involved, we may have to use more than one if-else statement in nested form as shown below, Here, if the condition 1 is false then it skipped to statement 3. But if the condition 1 is true, then it tests condition 2. If condition 2 is true then it executes statement 1 and if false then … Read more

The if-else statement : The general form of the if….else statement is as follows, if (test expression){ true-block statements; }else{ False-block statements; }statement-x Here, if the test expression is true, then the true-block statements will be executed, otherwise the false-block statements will be executed. In either case, either true block or false block statements will be executed, not both. The … Read more

Simple if statement : The general form of a simple if statement is as follows, if (test expression){ statement-block; }statement – x; Here, the statement block may contain a single statement or a group of statements. If the test expression is true then the statement block will be executed; otherwise it will be skipped to the statement – x. This … Read more

The if statement : The if statement is a powerful decision making statement and is used to control the flow of execution of statements. It is basically a two way decision-statement. It takes the following form,                         if(test expression) This point of program has two paths to follow, one for the true condition and the other for the false condition. That is shown … Read more

Decision making : In practice, users may have a number of situations where they may have to change the order of statements based on certain conditions. This is decision making. The decision making statements in C are as follows If statement switch statement Conditional operator statement goto statement