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