Bit masking question for update bit

[mohitshendre2609 (Mohit Shendre)]

void updatebit(int &n,int i,int v)
{
int mask=(~1<<i);
int cn=n&mask;
n=cn|(v<<i);
}
here for n=5,i=1,v=1;
the code should output 7
but it is giving 6 why?

[asaurabh_26 (logical coder)]

@mohitshendre2609

void updatebit(int &n,int i,int v)
{
int mask=(~1<<i);
int cn=n&mask;
n=cn|(v<<i);
}

correct one is

int mask=~(1<<i);
first right shift then take negation

i hope this help
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