In programming, it is common to use assignments to modify the contents of a variable. Remember that everything to the right of the equals sign is evaluated first, so we can say:

`myVar = myVar + 5;`

to add `5`

to `myVar`

. Since this is such a common pattern, there are operators which do both a mathematical operation and assignment in one step.

One such operator is the `+=`

operator.

`myVar += 5;`

will add `5`

to `myVar`

.

Convert the assignments for `a`

, `b`

, and `c`

to use the `+=`

operator.