In a shortcut operator expression, how can you represent 'variable = variable + expression'?

In C programming, the use of shortcut operators simplifies expressions that involve updating a variable based on its current value. The shortcut operator += is specifically designed to add a value to a variable and then assign the result back to that variable in a more concise way.

When using variable += expression, it effectively expands to variable = variable + expression. This means that whatever the current value of the variable is, the value of the expression is added to it, and then the result is stored back in the same variable. This reduces the amount of code you have to write and enhances readability.

The other options do not represent the intended operation properly. For instance, using variable + expression = variable implies that the sum is being assigned to variable, which negates the left-to-right assignment order that is required in C. Meanwhile, expression = variable + variable changes the context to a new variable representing the sum of two instances of variable, which does not accomplish the original purpose. On the other hand, stating variable = expression + variable places the expression first, deviating from the correct update mechanism where the updated variable should reflect the addition of expression to itself.

Thus, the correct approach to express