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it depends how you have coded your program as:
if you initialized your array (a) by loop from 0 then
int lb=0,ub=n-1; //n is number of elements in array
int mid=(lb+ub)/2;
printf("middle number is :%d",a[mid]);
if you initialized your array (a) by loop from 1 then
int lb=1,ub=n; //n is number of elements in array
int mid=(lb+ub)/2;
printf("middle number is :%d",a[mid]);
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