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C Programming

C language from basics to advanced placement prep

303 Q 10 Topics Take Test

Difficulty: All Easy Medium Hard 171–180 of 303

Topics in C Programming

All Basics & Syntax 100 Data Types & Variables 100 Control Flow 100 Functions 100 Arrays & Strings 100 Pointers 100 Structures & Unions 100 File Handling 100 Dynamic Memory 100 Preprocessor 100

Q.171 Easy Arrays & Strings

Consider a 2D array declared as: int matrix[3][4]. How many elements does it have?

A 3

B 4

C 7

D 12

Correct Answer: D. 12

EXPLANATION

A 2D array with dimensions 3x4 has 3*4 = 12 total elements.

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Q.172 Easy Arrays & Strings

What does the following code do? strcpy(dest, src);

A Compares two strings

B Copies string src to dest

C Concatenates two strings

D Finds length of string

Correct Answer: B. Copies string src to dest

EXPLANATION

strcpy() copies the contents of the source string to the destination string.

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Q.173 Easy Arrays & Strings

Which of the following is NOT a valid string initialization?

A char str[] = "Program";

B char str[10] = {'P','r','o','g'};

C char str[10]; str = "Program";

D char *str = "Program";

Correct Answer: C. char str[10]; str = "Program";

EXPLANATION

Array names are constant pointers and cannot be reassigned. Direct assignment to char array after declaration is invalid.

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Q.174 Easy Arrays & Strings

What will be the output of strlen("Hello") in C?

A 4

B 5

C 6

D Error

Correct Answer: B. 5

EXPLANATION

strlen() returns the length of the string excluding the null terminator '\0'. "Hello" has 5 characters.

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Q.175 Easy Arrays & Strings

What is the correct way to declare a 1D array of 10 integers in C?

A int arr[10];

B int arr(10);

C int arr{10};

D int [10]arr;

Correct Answer: A. int arr[10];

EXPLANATION

In C, arrays are declared with the syntax: datatype arrayname[size]. Option A follows the correct syntax.

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Q.176 Easy Functions

Consider the function declaration: void func(int x); and later in the code: int result = func(5);. What will be the compilation result?

A Compilation error because func returns void but is assigned to an int variable

B Compilation warning but will compile successfully; result will be undefined

C Successful compilation and result will be 5

D Runtime error will occur

Correct Answer: A. Compilation error because func returns void but is assigned to an int variable

EXPLANATION

A void function cannot return a value. Attempting to assign the return value of a void function to a variable will cause a compilation error in standard C compilers.

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Q.177 Easy Functions

What is the difference between declaring a function and defining a function?

A Declaration specifies the function signature; definition includes the function body

B They are the same thing in C

C Definition comes before declaration

D Declaration includes the function body; definition does not

Correct Answer: A. Declaration specifies the function signature; definition includes the function body

EXPLANATION

A declaration tells the compiler about the function's signature (return type, name, parameters); a definition provides the actual implementation (function body).

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Q.178 Easy Functions

Which keyword is used to pass arguments by reference in C?

A ref

B Pointers are used to simulate pass-by-reference

C reference

D &reference

Correct Answer: B. Pointers are used to simulate pass-by-reference

EXPLANATION

C does not have a 'ref' keyword like C++. Pointers are used to achieve pass-by-reference semantics in C by passing the address of a variable.

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Q.179 Easy Functions

What is the scope of a static function in C?

A Global scope across all files

B Limited to the file in which it is defined

C Limited to the function block only

D Available to all functions in the current block

Correct Answer: B. Limited to the file in which it is defined

EXPLANATION

A static function has internal linkage and is limited to the file in which it is defined. It cannot be accessed from other translation units.

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Q.180 Easy Functions

Which of the following is a correct function prototype in C?

A int func();

B func int();

C int func(void) { }

D func (void) int;

Correct Answer: A. int func();

EXPLANATION

A function prototype must have the return type first, followed by the function name and parameter list in parentheses. Option A is the correct syntax.

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