C programming

Bitfields in C are a feature that allows you to represent data structures with custom-sized bit fields within a struct. This can be particularly useful when memory is a concern, and you want to pack multiple fields together more efficiently. Bitfields are defined using a colon : followed by the number of bits each field should occupy.

Examples :

                       
                        #include <stdio.h>
                            // Define a structure with bitfields
                            struct Flags {
                                unsigned int flag1 : 1;  // 1 bit for flag1
                                unsigned int flag2 : 1;  // 1 bit for flag2
                                unsigned int flag3 : 1;  // 1 bit for flag3
                            };
                            
                            int main() {
                                // Declare a structure variable
                                struct Flags myFlags;
                            
                                // Set values using bitfields
                                myFlags.flag1 = 1;
                                myFlags.flag2 = 0;
                                myFlags.flag3 = 1;
                            
                                // Display the values
                                printf("Flag 1: %d\n", myFlags.flag1);
                                printf("Flag 2: %d\n", myFlags.flag2);
                                printf("Flag 3: %d\n", myFlags.flag3);
                                return 0;
                            }

Output:

            Flag 1: 1
            Flag 2: 0
            Flag 3: 1

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Q1.

Consider the following bit-field declaration in C:
                            struct Flags {
                                unsigned int flag1 : 1;
                                unsigned int flag2 : 3;
                            };
                            What is the size (in bits) of the entire structure Flags?

A. 4 bits

B. 8 bits

C. 12 bits

D. 16 bits

Q2. What is the primary advantage of using bit fields in C?

A. Improved code readability

B. Efficient memory usage

C. Enhanced security

D. Compatibility with other languages

Getting Started With C

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