What is the difference between + + and direct+ 1 in C or C + +?

Question

like a++ and a+1 , I know that a++ = a = a + 1 , besides this, what's the difference?

Answer 1

The biggest difference is that a+1 is just adding one to the variable a , but what do you do with it:

a = 3;
b = a + 1;

As a result, a still is 3 and b is 4.

But:

a = 3;
b = a++;

As a result, b is 4 but a is also 4 ( a++ means a = a+1 , so a has been changed).