Mastering Problem Solving in C

What is the purpose of the 'main' function in a C program?

• The 'main' function is the entry point of a C program.

• The 'main' function handles memory allocation in C programs.

• The 'main' function is used for defining global variables.

• The 'main' function is where all the functions are declared.

How do you declare a variable in C?

• declare variable_name as type;

• variable_name type;

• To declare a variable in C, use the syntax: 'type variable_name;'

• type: variable_name;

What is the difference between '==' and '=' in C?

• '=' is for comparison; '==' is for assignment.

• Both '=' and '==' are used for assignment.

• '==' is used for declaring variables; '=' is for comparison.

• '=' is for assignment; '==' is for comparison.

Explain the use of pointers in C programming.

• Pointers are only used for string manipulation in C.

• Pointers are used in C to manage memory, facilitate efficient data manipulation, and enable dynamic data structures.

• Pointers are used to create user interfaces in C.

• Pointers are a type of variable that cannot be changed in C.

What is a function prototype in C?

• A function prototype is a comment describing a function.

• A function prototype is a declaration of a function that specifies its name, return type, and parameters.

• A function prototype is a type of variable used in C.

• A function prototype is the actual implementation of a function.

How do you handle errors in C?

• Ignore errors completely

• Use global variables to track errors

• Use return values, check errno, and utilize error handling functions like perror().

• Always print error messages to the console

What is the significance of the 'return' statement in a function?

• The 'return' statement is used to define a function's name.

• The 'return' statement is necessary for a function to accept parameters.

• The 'return' statement is only used in recursive functions.

• The 'return' statement is significant because it allows a function to output a value and terminate its execution.

Describe the process of dynamic memory allocation in C.

• Memory allocation in C is static and cannot be changed at runtime.

• Dynamic memory allocation is done using printf() and scanf() functions.

• Dynamic memory allocation in C is done using malloc(), calloc(), realloc(), and free() functions.

• Dynamic memory allocation is only possible in C++ using new and delete.

What are arrays and how are they used in C?

• Arrays in C can only store integers.

• Arrays are used to store single values in C.

• In C, arrays are used to store multiple values of the same type in a single variable, allowing for efficient data handling.

• Arrays in C are dynamic and can change size automatically.

How can you implement a loop in C?

• Using 'repeat' and 'until' constructs

• Using 'loop' and 'endloop' keywords

• You can implement a loop in C using 'for', 'while', or 'do-while' constructs.

• Implementing loops with 'foreach' statements