C Programming - MCQ Practice Questions

How can you create a structure that can hold either an integer or a floating-point number, but not both simultaneously?

What is the difference between 'struct' and 'typedef struct' in C?

What will be the output if you read a union member that was not last written to?

In a nested structure scenario, how do you access a member of the inner structure?

What is the size of the following structure on a 32-bit system? struct Point { char c; int x; double y; }

What will be the output of this code? union Data { int a; char b; }; union Data d; d.a = 257; printf("%d %c", d.a, d.b);

What is the size of the following union? union Test { int a[5]; char b[10]; double c; }

Consider a structure with bit fields: struct Flags { unsigned int flag1 : 1; unsigned int flag2 : 3; unsigned int flag3 : 4; }; What is the minimum size of this structure?

What will happen if you try to compare two structures using the == operator directly?

Which of the following is a valid way to pass a structure to a function?

In a nested structure scenario like struct A contains struct B, how do you access a member of B from A's variable?

What is the purpose of using anonymous structures/unions?

Consider this structure: struct Complex { int real; int imag; }; If you want to create an array of 100 such structures, which declaration is correct?

Consider the following code: struct Data { int x; char y; double z; }; Assuming int=4 bytes, char=1 byte, double=8 bytes, what is the size of struct Data due to padding?

Which feature in C allows you to define a structure without a tag name for use within another structure?

In the context of bit fields in structures, what is the maximum number of bits that can be allocated to a single member in standard C?

Which of the following statements about structure initialization in C is INCORRECT?

What does fgets() function do?

Which function writes formatted data to a file?

What is the purpose of ftell() function?