You can see a program at your right side.
It's simple.
Point to be noted: We say b = a;
When we increase b, the value of b will be increased but a will not change. Why? because b = a means that value of a will be stored in b. When we print 'a', the original value of a is printed.
In the second program, &b = a means that value of a is stored in b and "by changing b value of a will be changed".
In other words b and a correspond to same number (which is 1 initially).
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