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