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