C Program to Replace Bits in Integer x from Bit Position a to b from another Integer y

This C Program replace bits in integer x from bit position a to b from another integer y.

Here is source code of the C Program to replace bits in integer x from bit position a to b from another integer y. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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/*
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 * C Program to Replace Bits in Integer x from Bit Position a to b from another Integer y

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 */
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#include <stdio.h>
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void changebits(int, int, int, int);
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int main()
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{
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    int num1, num2, pos1, pos2;
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```
 
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    printf("**Replacing the bits in integer x from bit position a to b from another integer y**\n");

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    printf("read number 1\n");
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    scanf("%x", &num1);
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    printf("Read number 2:\n");
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    scanf("%x", &num2);
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    printf("Read LSB postion:\n");
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    scanf("%d", &pos1);
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    printf("MSB should always be greater than LSB\n");

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    printf("Read MSB position:\n");
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    scanf("%d", &pos2);
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    changebits(num1, num2, pos1, pos2);
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    return 0;
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}
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/*Function to swap bits in given positions*/

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void changebits(int num1, int num2, int pos1, int pos2)

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{
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    int temp1, temp_1, buffer2, bit1 = 0, bit2 = 0, counter = 0, a = 1;

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    temp1 = num1;
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    temp_1 = num1;
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    buffer2 = num2;
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    for (;pos1 <= pos2;pos1++)        
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    {
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        a = 1;
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        num1 = temp_1;
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        num2 = buffer2;
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        while (counter <= pos1)
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        {
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            if (counter  == pos1)

                bit1 = (num1&1);    //placing the bit of position 1 in bit1

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            counter++;
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            num1>> = 1;
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        }
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        counter = 0;
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        while (counter <= pos1)
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        {
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            if (counter == pos1)
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                bit2 = (num2&1);        //placing the bit of position 2 in bit2

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            counter++;
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            num2 >>= 1;
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        }
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        counter = 0;
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        if (bit1 == bit2);
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        else
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        {
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            while (counter++<pos1)
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                a = a << 1;

            temp1 ^= a;    //placing the repplaced bit integer into temp1 variable

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        }
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        counter = 0;
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    }
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    printf("the number num1 after shifting the bits is 0x%x\n", temp1);

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}
```

$ cc bit13.c
$ a.out
**Replacing the bits in integer x from bit position a to b from another integer y**
read number 1
0x11223344
Read number 2:
0x55667788
Read LSB postion:
12
MSB should always be greater than LSB
Read MSB position:
19
the number num1 after shifting the bits is 0x11267344

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