The fourth day of learning C language

Main review

Compound assignment

5 An arithmetic operator ,+ - * / %, And assignment operators "=" Combine , Form a compound assignment operator :"+=" , "-=" , "*=" "/=" "%="

total+=5;

total=total+5;

Note that there is no space between the two operators

A short circuit

Logical operations are performed from left to right , If the result on the left can already determine the result , You don't do the right calculation

a==6&&b==1

a==6&&b+=1           ( Don't assign values to , Including compound assignments combined into expressions !)

about &&, On the left is false If so, don't do the right

about ||, On the left is true When you don't do the right side