programming-for-dummies

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Using Operators
The increment operator replaces the + 1 portion with ++, such as
j = 5;
i = ++j;
In the preceding example, the value of i is j + 1 or 6, and the value of j is
also 6.
If you place the increment operator after the variable, such as
j = 5;
i = j++;
Now the value of i is 5, but the value of j is 6.
The decrement operator works the same way except that it subtracts 1 from
a variable, such as
j = 5;
i = --j;
In the preceding example, the value of i is j - 1 or 4, and the value of j is
also 4.
If you place the decrement operator after the variable, such as
j = 5;
i = j--;
Now the value of i is 5, but the value of j is 4.
Assignment operators
Most programming languages use the equal sign to assign values to variables,
such as
i = 59;
However, C/C++ also includes combination assignment and mathematical
operators, as shown in Table 1-6.