C Programming Quiz by azka.xdlabin QuizMarch 4, 2025 C Programming Quiz 1 / 100How do you dynamically allocate memory in C? malloc(10 * sizeof(int)) memory(10) alloc(10) malloc(10) 2 / 100What is the correct syntax to declare a variable in C? int x; x int; int = x; variable x; 3 / 100What will happen if malloc() fails to allocate memory? Returns 0 Program crashes Undefined behavior Returns NULL 4 / 100What does continue do in a while loop? Jumps to another function Exits the loop Causes an infinite loop Skips the remaining statements of the current iteration and continues with the next iteration 5 / 100What is the index of the first element in an array? Depends on the array size -1 1 0 6 / 100What happens if recursion doesn't have a base case? The compiler automatically stops execution The recursion stops after 100 calls The program crashes due to stack overflow The function executes normally 7 / 100What is Recursion in C ? A function that calls itself A function with no parameters A function that runs infinitely A function with multiple return values 8 / 100Where can continue be used? Inside switch statements Inside functions only Inside loops only Inside if-else blocks 9 / 100How do you terminate a loop immediately in C? return break exit(0) continue 10 / 100What is the correct way to call a function? execute functionName(); functionName(); functionName = call; call functionName; 11 / 100Which statement is not a jump statement? break goto switch continue 12 / 100Which data type is used to store a single character in C? char character text string 13 / 100What is a structure in C? A collection of variables of different data types under one name A keyword for memory allocation A function that holds multiple variables A collection of variables of the same data type 14 / 100Which of the following statements about recursion is false? Every recursion must have a base case Recursion is faster than iteration in all cases Recursion always uses more memory than iteration Recursion always uses more memory than iteration 15 / 100How do you declare an enum variable in C? enum Color c; c = enum Color; enum c = Color; Color c; 16 / 100How do you access structure members using a pointer? ptr(member) ptr.member ptr->member ptr:member 17 / 100What is the purpose of the else if statement? It terminates the program if no condition is true It runs when the if condition is false It allows checking multiple conditions It runs only if the else statement runs 18 / 100Which of the following is required to prevent infinite recursion? A break statement A base condition A loop inside the function A goto statement 19 / 100Which of the following is NOT a type of loop in C? foreach loop for loop do-while loop while loop 20 / 100Which of the following correctly initializes an array? int arr[] = {1, 2, 3}; All of the above int arr[3] = {1}; int arr[3] = {1, 2, 3}; 21 / 100What is a structure in C? A type of pointer A function that initializes variables A type of loop A user-defined data type that groups different data types together 22 / 100How do you declare an integer array of size 5 in C? array int arr[5]; int[5] arr; int arr[5]; int arr(5); 23 / 100What is the main difference between break and continue? break can only be used in switch, continue can only be used in loops break and continue are the same break stops loop execution, while continue skips an iteration continue stops loop execution, while break skips an iteration 24 / 100What happens if the condition in a loop is always true? The loop will run indefinitely (infinite loop) The program will crash The compiler will throw an error The loop will exit after 10 iterations 25 / 100What is the best practice regarding goto in C? Use it only in switch statements Avoid using it as much as possible Use it frequently for better readability It is required in all C programs 26 / 100What happens if break is used outside a loop or switch? It causes an infinite loop It causes a compilation error It is ignored by the compiler It works normally 27 / 100What is a function in C? A variable that stores multiple values A block of code that performs a specific task A keyword used for iteration A loop structure 28 / 100What is the output of the following code? Compilation error 10 15 5 29 / 100How do you declare a pointer to a structure? ptr struct Student; Student* ptr; Student ptr; struct Student* ptr; 30 / 100Which of the following is the correct syntax for an if statement in C? if x > 5 then printf("Hello"); if (x > 5) { printf("Hello"); } if x > 5 { printf("Hello"); } if (x > 5) printf("Hello"); 31 / 100Which of the following is NOT a jump statement in C? return switch continue break 32 / 100Which statement is true about an enum? Enum constants must be unique Enum variables can store any integer value, not just the defined constants Enum constants can have floating-point values Enum constants can be repeated within the same enum 33 / 100What is the output of the following program? 1 2 1 2 3 1 2 3 4 5 1 2 4 5 34 / 100What is the keyword used to define a structure in C? typedef structure class struct 35 / 100What will be the default value of GREEN in the following code?enum Color { RED, GREEN, BLUE }; It depends on user input 0 1 2 36 / 100What is the purpose of typedef in structures? To create an alias for an existing function To allocate memory dynamically To simplify the declaration of structure variables To prevent modification of structure members 37 / 100How do you access structure members in C? Using & operator Using * operator Using . operator Using -> operator 38 / 100What is the format specifier for printing an integer in C? %d %s %f %c 39 / 100What is the difference between void and int functions? void functions cannot have parameters void functions do not return a value, while int functions return an integer int functions run faster than void functions int functions cannot use printf() 40 / 100What is the size of an int variable in C (typically on a 32-bit system)? 8 bytes 1 byte 2 bytes 4 bytes 41 / 100What is the output of the following code? 5 10 15 20 42 / 100In which of the following can break be used Loops only switch only Both loops and switch Functions only 43 / 100What will happen if a function is used without a prototype in C? The function will be ignored by the compiler The function will execute twice The program will run normally The program may give a compilation warning or error 44 / 100How are multi-dimensional arrays stored in memory? Not stored in memory Random order Row-major order (row-wise) Column-major order (column-wise) 45 / 100Can an array size be changed after declaration in C? Yes, using the realloc function Yes, by assigning a new array Yes, using resize function No, array size is fixed 46 / 100Can the conditional expression in an if statement be non-integer values? No, only integers are allowed Only float values are allowed Yes, it can be any non-zero value Only boolean values are allowed 47 / 100What will be the output of the following program? 1 2 3 4 1 2 3 4 5 1 2 3 1 2 48 / 100What is the purpose of typedef with unions? To prevent modification of union members To allocate memory dynamically To create an alias for the union type To improve execution speed 49 / 100What is the purpose of a function prototype? To prevent function calls To define the function To improve execution speed To inform the compiler about the function before its use 50 / 100Which loop is used when the number of iterations is known? do-while while switch for 51 / 100Which of the following is a logical operator in C? || All of the above && ! 52 / 100How do you access a structure member? struct->member struct.member() struct.member struct:member 53 / 100Which statement is true about return? It is used to return a value from a function It can be used in loops to skip an iteration It stops execution but does not return control to the calling function It can only be used in main() 54 / 100What is a function prototype in C? A function definition A function declaration before its actual definition A function with no parameters A function that doesn't return any value 55 / 100What is the size of an enum in C? Same as a char (1 byte) Same as an int (usually 4 bytes) Depends on the number of members 8 bytes 56 / 100What is an enumeration (enum) in C? A user-defined data type consisting of named integer constants A data type that stores multiple values of different types A type of structure that holds functions A pointer to an integer array 57 / 100What is a pointer in C? A keyword used to store addresses A function that returns memory size A data type A variable that stores the address of another variable 58 / 100What is the output of this program? World Hello World Compilatoin error Hello 59 / 100Can a structure contain a pointer to itself? Only in C++ Only if the pointer is initialized Yes No 60 / 100What will be the output of this code? 1 2 3 1 2 3 Compilation error 61 / 100What is the difference between while and do-while loops? do-while loop executes at least once, while may not execute at all No difference while loop checks the condition first, do-while checks it last Both a & b 62 / 100How do you find the number of elements in an array in C? size(arr) sizeof(arr) / sizeof(arr[0]) count(arr) length(arr) 63 / 100How do you define an enumeration in C? enumeration Color { RED, GREEN, BLUE }; enum { RED, GREEN, BLUE } Color; define enum Color { RED, GREEN, BLUE }; enum Color { RED, GREEN, BLUE }; 64 / 100What will be the output of the following code? 2 Compilation error 2.000000 2.500000 65 / 100What is the correct way to declare and initialize a structure variable? struct s = {10, 3.5}; s = {10, 3.5}; MyStruct s = {10, 3.5}; struct MyStruct s = {10, 3.5}; 66 / 100Which of the following is a correct way to free allocated memory? free(ptr); clear(ptr); remove(ptr); delete ptr; 67 / 100Which of the following statements is true about structures? A structure cannot have another structure as a member A structure is the same as a class in C++ A structure can have an array as a member A structure can contain functions 68 / 100What does the break statement do? Exits a loop or switch statement Jumps to a labeled statement Stops execution of a program Skips the current iteration of a loop 69 / 100What is an array in C? A collection of variables of the same data type stored in contiguous memory A function that stores multiple values A collection of variables of different data types A pointer that stores memory addresses 70 / 100What is the main advantage of recursion? It reduces memory usage It prevents stack overflow It makes code shorter and easier to understand It always runs faster than loops 71 / 100How do you define a structure in C? struct MyStruct { int a; float b; }; struct MyStruct ( int a; float b; ); structure MyStruct { int a; float b; } struct { int a; float b; } 72 / 100Which operator is used to get the address of a variable? & # @ * 73 / 100How do you define a structure in C? structure MyStruct { int x; float y; }; struct MyStruct { int x; float y; }; define struct { int x; float y; }; struct { int x; float y; }; 74 / 100How do you define a union in C? union Data { int a; float b; }; Data union { int a; float b; }; structure Data { int a; float b; }; data union { int a; float b; }; 75 / 100What is the purpose of the break statement? To exit a loop or switch statement To return a value from a function To jump to a labeled statement To skip the current iteration of a loop 76 / 100What is the correct syntax to declare a pointer to an integer? int ptr*; ptr int*; int *ptr; *int ptr; 77 / 100 Which of the following is NOT a valid format specifier in C? %lf %d %p% %Lf 78 / 100Which of the following is a correct function prototype? int sum(int a, int b); sum(a, b); int sum(a, b); sum(int a, int b); 79 / 100What will happen if you try to dereference a NULL pointer? It will print 0 It will print NULL Program will crash Compilation error 80 / 100What is the output of this program? Compilation Error 1 1 2 3 3 2 1 81 / 100What will be the output of this program? Compilation error 3 4 5 1 2 3 4 5 1 2 4 5 82 / 100Which operator is used for bitwise XOR? ~ | ^ & 83 / 100What is a function prototype in C? A declaration of a function before its definition A built-in function in C A function without a return value A function that runs automatically 84 / 100Which of the following is used to read input from the user in C? getchar scanf printf print 85 / 100How do you declare a union variable in C? Example obj; union Example obj; struct Example obj; data union Example obj; 86 / 100Which of the following is a conditional statement in C? if do-while for while 87 / 100Which statement is used to exit a switch case? stop exit return break 88 / 100What is a dangling pointer? A pointer that points to a deallocated memory location A pointer that points to NULL A pointer that is uninitialized A pointer that stores an address in hexadecimal 89 / 100What is the correct syntax to declare a function in C? functionName() void; void = functionName(); void functionName(); declare function functionName(); 90 / 100What happens if two enumeration constants have the same value? Causes undefined behavior Runtime error Allowed without any error Compilation error 91 / 100What is a Union in C ? A special type of array A data structure that allows only integer values A collection of unrelated functions A user-defined data type where all members share the same memory location 92 / 100What will be the output of the following code? Compilation error 5 10 15 93 / 100What is the main difference between a struct and a union? A struct uses less memory than a union A struct stores all its members separately, while a union shares memory among all members There is no difference between them A union allows multiple values to be stored simultaneously 94 / 100What is the ASCII value of '0'? 48 0 49 -48 95 / 100Which of the following is the assignment operator in C? = += != == 96 / 100How do you pass an argument by reference in C? Using a pointer (*) Using a return statement Using an ampersand (&) Using an array 97 / 100What is the correct syntax for a for loop? for(initialization; condition; update) { body } for(condition; initialization; update) { body } for(initialization, update, condition) { body } for(update; initialization; condition) { body } 98 / 100What happens if you access an array index that is out of bounds? It will cause a compilation error It will always print 0 The program will terminate immediately It may cause unpredictable behavior (segmentation fault) 99 / 100Which operator is used to access union members? & . * -> 100 / 100What is the purpose of the return 0; statement in the main() function? It is used to take input from the user It is required in every C program It indicates successful program termination It is used to return a value to printf Your score isThe average score is 36% 0% Restart quiz
