Programming in C MCQ - Constants, Variables and Data Types

6 int i = 5; is a statement in a C program.

An automatic local variable is associated with an object whose storage exists during execution of its enclosing block. Its value can change during execution. The exact memory address is not guaranteed to change or remain fixed across different executions.

7 In C, what is the resulting data type of an addition expression when one operand is int and the other is float?

The result type of an arithmetic expression depends on the operand types and the usual arithmetic conversions. When int and float operands participate in the same arithmetic operation, the int operand is converted to float and the result has type float.

8 Which of the following groups of data types supports built-in arithmetic operations in C?

Operations on strings and sets are commonly considered operations on structured data. In C, strings are represented using character arrays or pointers, and the language does not provide a built-in set type.

9 In C, which declaration is used in another source file to refer to a file-scope variable defined elsewhere that has external linkage?

A global variable declared at file scope can be accessed by functions for which its declaration is visible. An external variable can also be shared across source files through an appropriate extern declaration.

10 In C, what happens when an int operand and a double operand are used together in an arithmetic expression?

In C, the usual arithmetic conversions determine a common type for arithmetic operands. When one operand is int and the other is double, the int operand is converted to double. The arithmetic operation is performed using double, and the resulting expression has type double. Therefore, option B is correct.