Answer Posted / angad

t=0;
for(i=n; i>0; i--)
{
t|=(1<<p);
p++;
}
x=x&~t
t=t&(y<<p);
x=x|t;
}

x=10100110
y=11110111
let,p=3,n=4

after for loop, t=01111000 - mask for the n(=4) bits starting from the p(=3) bit that need to be altered in x

x=x&~t;
x =10100110
~t=10000111
ANDing clears the 4 bits to zero(bits 3-6)
x=1 0000 111

we need to extract the 1st n(=4) bits out of y , and shift them left to align them against the n(=4) bits of x we need to alter, therefore, left shift y by p(=3)
t=t&(y<<p)

y<<p = 1 0111 000
t = 0 1111 000
AND=>t = 0 0111 000

now x = 1 0000 111
t = 0 0111 000

x=x|t =>1 0111 111

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