Some Interview Questions of C Language.... 11) What is C token? The smallest individual units of a C program are known as tokens. 12) List the different types of C tokens? • Constants • Identifiers • Keywords • Operators • Special symbols • Strings 13) What is a string? A string is a sequence of characters ending with NUL. It can be treated as a one–dimensional array of characters terminated by a NUL character. 14) What are qualifiers? Qualifiers or modifiers are identifiers that may precede the scalar data types (except float) to specify the number of bits used for representing the respective type of data in memory. The qualifiers in C are short, long, signed, and unsigned. 15) What is a function? A function is a set of statements to perform a specific task. 16) What is a constant? A constant is a value that does not change during the program execution. A constant used in C does not occupy memory. 17) What are the different types of constants? • There are five types of constants. They are : • Integer constants • Floating point constants • Character constants • String literals • Enumeration constants 18) What is variable? An identifier is used to identify and store some value. If the value of the identifier is changed during the execution of the program, then the identifier is known as variable. 19) What are the rules for the identifier? • The first character must be an alphabet or underscore (_) • Digits may be included in the variable • The maximum number of characters in a word are 32 (It may vary depending upon the platform) • No other special characters are allowed. 20) What are global variables? Global Variables are those, which are required to be acccessed by all the functions defined after their declaration. So, the variables declared before the main {) can be accessed by all the functions, which follow their declaration. 21) What is a keyword? Keywords are those words of C which have predefined meaning assigned by the C language. They form a part of the database required by the C compiler. 22) What are the different types of c instructions? • There are basically three types of instructions in C are : • Type Declaration Instruction • Arithmetic Instruction • Control Instruction 23) What is an expression? Expression is defined as a combination of operands and operators to obtain some computation. Operands represent variables or values and The operator tells is what operation to be performed. 24) What are the types of data files? • There are two types of data files : • stream oriented or standard data files • system oriented or low level data files 25) Why C is called a middle level language? C combines the features of both Assembly Level Languages (Low Level Languages) and Higher Level Languages. For this reason, C is referred to as a Middle Level Language. The feature of ALLs is that of enabling us to develop system level programs and the features of HLLs are those of higher degree of readability and machine independence. 26) How can variables be characterized? The variables can be categorized by storage class as well as by data type. The storage class specifies the portion of the program within which the variables are recognized. 27) Give the rules for variable declaration? • The rules for variable declaration in C are given below : • A variable name consists of alphabets, digits and the underscore (_) character • The length of variable should be kept upto 8 characters though your system may allow upto 40 characters • They must begin with an alphabet • Some systems also recognize an underscore as the first character • White space and commas are not allowed • Any reserved word (keyword) cannot be used as a variable name. 28) What is the purpose of type declarations? The type declaration allow to create a synonym for other data types. Its syntax is typedef type identifier; The declaration typedef unsigned long int INTEGER 29) What is recursion? C language a function may call another function. When a function calls itself, it is referred to as recursive call and the process is known as recursion. C provides very good facilities for recursion. 30) What is data types? Data types refer to the classes of data that can be manipulated by C programs. The three fundamental data types supported by C are character, integer and real type. ..........wait for next update....
Posted on: Mon, 26 Aug 2013 11:11:53 +0000
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