Here is some topic-related information about C programming in tabular format:
| Topic | Description |
|---|---|
| What is C? | C is a general-purpose programming language that is widely used for system and application software development. It is known for its efficiency and flexibility. |
| Data Types in C | C supports various data types, such as int, char, float, double, and void, to define variables and manage data. |
| Control Structures | C provides control structures like if, else, while, for, and switch to control the flow of execution in a program. |
| Functions | Functions in C are used to organize code into reusable blocks, helping with modularity and readability. |
| Pointers | A pointer in C is a variable that stores the memory address of another variable. It is crucial for dynamic memory allocation and manipulation of data. |
| Arrays | An array in C is a collection of similar data elements stored in contiguous memory locations, accessed by indices. |
| Memory Management | C allows dynamic memory management using functions like malloc(), calloc(), and free(). |
| Structures | A structure in C is a user-defined data type that allows the grouping of variables of different types. |
| Preprocessor Directives | Directives like #define, #include, and #if are used for macro definitions and conditional compilation. |
| Error Handling | C uses errno, perror(), and assert() to handle errors and exceptions during program execution. |
| C Libraries | C has a standard library that includes functions for input/output operations, string manipulation, memory allocation, and more. |
This table provides a quick overview of some essential topics related to C programming. Each row gives an idea of the topic's significance and role in developing C applications.
Question
Which of the following is a valid variable declaration in C?
Answerint number;
Question
What does the main function in C return?
Answer
The main function returns an integer value, usually 0.
Question
Which header file is required for using the printf function?
Answer
The stdio.h header file is required.
Question
What is the correct way to write a comment in C?
Answer// This is a single-line comment
Question
What is the result of the expression 5 / 2 in C?
Answer
The result will be 2 (integer division).
Question
Which operator is used for logical AND in C?
Answer
The logical AND operator is &&.
Question
What is the output of the following code?
Answer
The output will be 8.
Question
Which of the following data types can store decimal values in C?
Answer
The float and double data types can store decimal values.
Question
Which control structure is used to execute a block of code multiple times in C?
Answer
A for loop is used to repeat a block of code.
Question
Which of the following is not a valid C data type?
Answerinteger is not a valid C data type; it should be int.
Question
What is the size of an int in C?
Answer
The size of an int is typically 4 bytes.
Question
Which of the following operators is used for modulo in C?
Answer
The modulo operator is %.
Question
What is the use of the break statement in C?
Answer
The break statement is used to exit from a loop or switch case.
Question
Which of the following is a valid array declaration in C?
Answerint numbers[10];
Question
How do you declare a function in C?
Answer
A function is declared by specifying the return type, function name, and parameters:returnType functionName(parameters);
Question
What will be the output of the following code?
Answer
The output will be 2.
Question
Which loop is best when the number of iterations is known beforehand?
Answer
A for loop is used when the number of iterations is known.
Question
What does the sizeof operator do in C?
Answer
The sizeof operator returns the size of a variable or data type in bytes.
Question
Which keyword is used to define a constant value in C?
Answer
The const keyword is used to define a constant.
Question
What does return 0; indicate in a C program?
Answerreturn 0; indicates that the program has executed successfully.
Question
What is the correct syntax to declare a pointer in C?
Answer
A pointer is declared by using the * symbol:int *ptr;
Question
What is a null pointer in C?
Answer
A null pointer is a pointer that does not point to any memory location and is assigned the value NULL.
Question
Which function is used to dynamically allocate memory in C?
Answer
The malloc function is used to allocate memory dynamically.
Question
How do you terminate a while loop in C?
Answer
A while loop can be terminated using the break statement.
Question
What is the difference between == and = in C?
Answer== is used to compare values, while = is used for assignment.
Question
What is the output of the following code?
Answer
The output will be 12.
Question
What is the purpose of the continue statement in C?
Answer
The continue statement skips the current iteration of a loop and moves to the next iteration.
Question
What is the use of switch statement in C?
Answer
The switch statement is used to execute one out of several code blocks based on the value of a variable.
Question
Which of the following is used to declare a constant in C?
Answer
The #define preprocessor directive is used to declare constants.
Question
How do you create a user-defined function in C?
Answer
A user-defined function is created by specifying the return type, name, and parameters:returnType functionName(parameters) { ... }
Question
What is the use of #include in C?
Answer
The #include directive is used to include header files in a program.
Question
Which of the following is a valid pointer operation in C?
Answer
Dereferencing a pointer using * is a valid pointer operation:*ptr
Question
What does void indicate in C?
Answervoid indicates that the function does not return a value.
Question
What is the role of the return statement in C?
Answer
The return statement is used to return a value from a function to the calling function.
Question
How do you declare a structure in C?
Answer
A structure is declared using the struct keyword:struct Student { int age; char name[20]; };
Question
What is the purpose of #define in C?
Answer#define is used to define constants or macros in C.
Question
Which of the following is used to declare an array of 5 integers in C?
Answerint arr[5];
Question
What is the function of the strlen function in C?
Answer
The strlen function returns the length of a string.
Question
Which operator is used to access members of a structure in C?
Answer
The . (dot) operator is used to access members of a structure.
Question
Which of the following is used to store the address of a variable in C?
Answer
The & (address-of) operator is used to get the address of a variable.
Question
What is the purpose of the scanf function in C?
Answer
The scanf function is used to take input from the user.
Question
What is the difference between float and double in C?
Answerfloat is a single-precision floating-point data type, while double is a double-precision floating-point data type.
Question
Which keyword is used to define a function prototype in C?
Answer
The void keyword is used when a function does not return any value.
Question
What is an infinite loop in C?
Answer
An infinite loop occurs when the loop condition is always true and the loop never exits.
Question
How do you define a function that accepts parameters in C?
Answer
A function with parameters is defined as follows:returnType functionName(parameter1, parameter2) { ... }
Question
What is the difference between a for loop and a while loop in C?
Answer
A for loop is used when the number of iterations is known, while a while loop is used when the condition is checked before each iteration.
Question
What does the exit function do in C?
Answer
The exit function is used to terminate the program with a specified exit status.
Question
What is the use of #ifdef in C?
Answer#ifdef is used for conditional compilation, checking whether a macro is defined.
Question
What is the output of the following code?
Answer
The output will be 6.
Question
What is the difference between char and int in C?
Answerchar is used to store a single character, while int is used to store integer values.
Question
How is memory allocated dynamically in C?
Answer
Memory is allocated dynamically using the malloc function.
Question
What is the purpose of the sizeof operator in C?
Answer
The sizeof operator is used to determine the size of a data type or variable in bytes.