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