The if statement by itself will execute a single statement, or a group of statements, when the expression following if evaluates to true. It does nothing when the expression evaluates to false. Can we execute one group of statements if the expression evaluates to true and another group of statements if the expression evaluates to … Read more
Like most languages, C uses the keyword if to implement the decision control instruction. The general form of if statement looks like this: if ( this condition is true )execute this statement ; The keyword if tells the compiler that what follows is a decision control instruction. The condition following the keyword if is always … Read more
Control Instructions enable us to specify the order in which the various instructions in a program are to be executed by the computer. In other words the control instructions determine the ‘flow of control’ in a program. There are four types of control instructions in C. They are: Sequence Control Instruction Selection or Decision Control … Read more
While executing an arithmetic statement, which has two or more operators, we may have some problems as to how exactly does it get executed. For example, does the expression 2 * x – 3 * y correspond to (2x)-(3y) or to 2(x-3y)? Similarly, does A / B * C correspond to A / (B * … Read more
There are basically three types of instructions in C: Type Declaration Instruction Arithmetic Instruction Control Instruction The purpose of each of these instructions is given below: a) Type declaration instruction To declare the type ofvariables used in a Cprogram b) Arithmetic instruction To perform arithmeticoperations between constants and variables c) Control instruction To control the … Read more
Keywords are the words whose meaning has already been explained to the C compiler (or in a broad sense to the computer). The keywords cannot be used as variable names because if we do so we are trying to assign a new meaning to the keyword, which is not allowed by the computer. Some C … Read more
C constants can be divided into two major categories: Primary Constants Secondary Constants Rules for Constructing Integer Constants An integer constant must have at least one digit. It must not have a decimal point. It can be either positive or negative. If no sign precedes an integer constant it is assumed to be positive. No … Read more
C is a programming language developed at AT & T’s Bell Laboratories of USA in 1972. It was designed and written by a man named Dennis Ritchie. In the late seventies C began to replace the more familiar languages of that time like PL/I, ALGOL, etc. No one pushed C. It wasn’t made the ‘official’ … Read more