Bit-Fields in C - Real World Example

April 04, 2026

C Pattern Programs: Square Number and Alphabet Patterns Explained

🔷 Square Star Pattern 📋 Copy Code #include <stdio.h> int main() { int num; printf("Enter the number:\n"); scanf("%d", &num); for(int i = 1; i <= num; i++) { for(int j = 1; j <= num; j++) { printf("* ");//keep"* " } printf("\n"); } return 0; } 🔷 Reverse Square Alphabet Pattern (Column-wise) 📋 Copy Code #include <stdio.h> int main() { int num; printf("Enter the number:\n"); scanf("%d", &num); for(int i = num; i >= 1; i--) { for(int j = num; j >= 1; j--) { printf("%c ", j + 64);//%c for Character and 64 will be ASIIC VALUE } printf("\n"); } return 0; } 🔷 Reverse Square Alphabet Pattern (Row-wise) 📋 Copy Code #include <stdio.h> int main() { int num; ...

📌 Bit-Fields in C – Real World Example

🔋 1. Embedded System: Status Flags using Bit-Fields

#include <stdio.h>

struct StatusFlags {
    unsigned int powerOn : 1;
    unsigned int error : 1;
    unsigned int batteryLow : 1;
    unsigned int reserved : 5;
};

int main() {
    struct StatusFlags device = {1, 0, 1, 0};

    printf("Power ON: %u\n", device.powerOn);
    printf("Error: %u\n", device.error);
    printf("Battery Low: %u\n", device.batteryLow);

    return 0;
}

🧠 Explanation:

struct StatusFlags uses only 8 bits (1 byte) instead of 4 bytes.
Each flag (like power, error) is a bit-field that takes just 1 bit.
Perfect for embedded systems where memory and performance are critical.

🖥️ Sample Output:

Power ON: 1
Error: 0
Battery Low: 1

🔑 Keywords:

bit field in C, struct with bit-fields, embedded systems flags, memory-efficient C code, real-world struct usage, flag register, C interview examples

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C Pattern Programs: Square Number and Alphabet Patterns Explained