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 + 7;

to add 7 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.

var myVar = 1;
myVar += 5;
console.log(myVar);    // Returns 6

Exercices

Convert the assignments for a, b, and c to use the += operator.