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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; ...
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Nibble Swapping in C (Hexadecimal Input) in C

Nibble Swapping in C

🔶 Nibble Swapping in C (Hexadecimal Input)

#include<stdio.h>
int main( )
{
    unsigned int num;
    printf("Enter the number(in hex):");
    scanf("%x",&num);
    num = num & 0xFF;
    unsigned int swapped = ((num & 0x0F) << 4) | ((num & 0xF0) >> 4);
    printf("After swapping number is: %02X\\n", swapped);
    return 0;
}

📘 Explanation:

This C program swaps the upper and lower 4-bit nibbles of an 8-bit hexadecimal number.

🔹 `scanf("%x", &num);` reads a hexadecimal value.
🔹 `num & 0xFF` ensures the value is within 8 bits.
🔹 `(num & 0x0F) << 4` moves the lower nibble to the upper nibble position.
🔹 `(num & 0xF0) >> 4` moves the upper nibble to the lower nibble position.
🔹 The final result is obtained by combining both using bitwise OR (`|`).
🔹 `%02X` prints the swapped result in uppercase hexadecimal format with leading zero if needed.

🔍 Sample Output:

Enter the number(in hex):3C
After swapping number is: C3

Enter the number(in hex):F0
After swapping number is: 0F

🏷️ Keywords:

bitwise operations in C, swap nibbles C, C program hex input, 8-bit nibble swap, binary logic in C, nibble masking, hex manipulation

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