Coding Skill Test -I

What are the basic data types available in C?

• boolean

• array

• string

• int, float, double, char, void

Explain the difference between 'if' and 'switch' control structures.

• The 'if' structure is for conditional checks, while 'switch' is for evaluating multiple cases based on a single expression.

• 'if' is a function, while 'switch' is a variable type.

• 'if' is used for loops, while 'switch' is for single conditions.

• 'if' can only handle two cases, whereas 'switch' can handle more than two.

What is a function in C and how is it defined?

• A function in C is a variable that stores data.

• A function in C is a type of loop used for iteration.

• A function in C is a block of code defined with a return type, name, and parameters, used to perform specific tasks.

• A function in C is a keyword that defines a data structure.

Describe recursion and provide an example of a recursive function.

• A function to calculate the sum of an array: function sum(arr) { return arr.reduce((a, b) => a + b, 0); }

• A function to reverse a string iteratively: function reverse(str) { let reversed = ''; for (let i = str.length - 1; i >= 0; i--) { reversed += str[i]; } return reversed; }

• A function to find the maximum number in an array: function max(arr) { return Math.max(...arr); }

• A recursive function to calculate factorial: function factorial(n) { if (n === 0) { return 1; } else { return n * factorial(n - 1); } }

What is a pointer in C and how is it used?

• A pointer in C is a special kind of loop used for iteration.

• A pointer in C is a type of function that returns a variable.

• A pointer in C is a variable that stores a string value.

• A pointer in C is a variable that holds the address of another variable, used for direct memory access and manipulation.

How do you dynamically allocate memory in C?

• Use malloc(), calloc(), realloc(), and free() functions.

• Use printf() to allocate memory.

• Use free() to allocate memory.

• Use strcpy() for dynamic memory allocation.

What is the purpose of a structure in C?

• To manage memory allocation in C.

• To define functions in C.

• The purpose of a structure in C is to group different data types into a single unit.

• To create loops in C.

Explain the difference between a structure and a union in C.

• A structure allocates separate memory for each member, while a union shares the same memory for all members.

• A union can only contain integer types, while a structure can contain any data type.

• A structure can hold only one type of data, while a union can hold multiple types.

• A structure is faster to access than a union because it uses less memory.

What is decision making in C programming?

• Decision making in C programming involves defining variables only.

• Decision making in C programming refers to the use of control structures to execute different actions based on conditions.

• Decision making in C programming is about writing comments.

• Decision making in C programming refers to the use of loops for iteration.

How do you implement a 'for' loop in C?

• for(i = 0; i < n; i++) // code to execute

• for(int i = 0; i < n; i++) // execute code here

• for(int i = 0; i < n; i++) { code to execute }

• for(int i = 0; i < n; i++) { // code to execute }