Programming in C

All statements are true. There is no mistake in any statement.

Both of option (2) and (3) are valid comparison statements.
The operator == checks if the values of two operands are equal or not, if yes then condition becomes true.

register variables are stored in register memory.
register is a storage specifier used to enable faster access of a variable.

The statement is incorrect about array.
Array size must be a constant value.

%i and %d are used to print integers.
These are identical for printf( ) but different for scanf( ).

Correct answer; The range of unsigned long int is 0 to 4294967295.

int a[ ]; is an invalid array declaration because size of array is not specified.

Both of statement (a) and (d) are incorrect about C language.
a) C language was developed at Bell Laboratories in 1972 by Dennis Ritchie.
d) C language is a structure oriented programming language.

Relational operators are used to compare the value of two variables.
>, <, >=. <=, == and != are relational operators.

The statement is true about union.
We can access only one member of union at a time because union allocates one common storage space for all its members.

Assembler is a low level language.
Low level languages provides nothing other than access to the machines basic instruction set

Incomplete comment! There shoud be a / in the last of the statement.
/________*/ is used to create single line and multiple line comments.

5=a; is an invalid statement.
= is an assignment operator and left operand of the assignment operator must be a variable.

All of (a) empsal101, (e) emp_sal101 and (g) emp101sal are valid identifiers.
(b) emp.sal101, (c) 101emp_sal, (d) emp sal 101 and (f) 101empsal have mistakes.
In (b) emp.sal101 fullstop is used. (No other special symbol rather than underscore can't be used in names of identifiers.)
In (c) 101emp_sal a number is used in starting of identifier. (An identifier should not start with a number.)
In (d) emp sal 101 spaces are used. (Spaces are not allowed within names of identifiers.)
In (f) 101empsal a number is used in starting of identifier. (An identifier should not start with a number.)

In a structure oriented language a program is divided into small programs called functions.
C functions are basic building blocks in a program. All C programs are written using functions to improve reusability, understandability and to keep track on them. A large C program is divided into basic building blocks called C function. C function contains set of instructions enclosed by “{}” which performs specific operation in a C program. Actually, Collection of these functions creates a C program.