Code:
#include stdio.h
void replace_bits(int, int, int, int);
int main()
{
int number_x, number_y, start_pos, end_pos;
printf("\nEnter the number x in hexa decimal ");
scanf("%x", &number_x);
printf("\nEnter the number y in hexa decimal");
scanf(" %x", &number_y);
printf("\nEnter value for a");
scanf("%d", &start_pos);
printf("\nEnter value for b");
scanf("%d", &end_pos);
replace_bits(number_x, number_y, start_pos, end_pos);
}
/*
* Replace bits in first number from specified position with bits in second number
*/
void replace_bits(int number_x, int number_y, int start_pos, int end_pos)
{
int i, shift_y, ybit;
long int temp, t;
/*
* Replace the corresponding x bits by y bits
*/
for (i = start_pos;i <= end_pos;i++)
{
shift_y = number_y >> i;
ybit = shift_y & 1;
if (ybit == 1)
{
temp = 1 << i;
number_x = number_x | temp;
}
if (ybit == 0)
{
t = 0XFFFFFFFF;
temp = 1 << i;
start_pos = t ^ temp;
number_x = number_x & start_pos;
}
}
printf("%x", number_x);
}
Output:
Enter the number x in hexa decimal 11223344
Enter the number y in hexa decimal55667788
Enter value for a12
Enter value for b19
11267344
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