Everything to the right of the equals sign is evaluated first, so we can say
myVar = myVar + 5; to add
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
myVar += 5; will add 5 to myVar instead of using any of the follwoing:
myVar = 5 + myVar; myVar = myvar + 5;