What is the difference between a += b and a =+ b , also a++ and ++a?

As I mentioned in the title,

What is the difference between a += b and a =+ b , also a++ and ++a ? I'm little confused

a += b is equivalent to a = a + b

a = +b is equivalent to a = b

a++ and ++a both increment a by 1. The difference is that a++ returns the value of a before the increment whereas ++a returns the value after the increment.

That is:

a = 10;
b = ++a; //a = 11, b = 11

a = 10;
b = a++; //a = 11, b = 10

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a += b is equivalent to a = a + b

a = +b is equivalent to a = b

a++ is postfix increment and ++a is prefix increment. They do not differ when used in a standalone statement, however their evaluation result differs: a++ returns the value of a before incrementing, while ++a after. I.e.

int a = 1;
int b = a++; // result: b == 1, a == 2
int c = ++a; // result: c == 3, a == 3

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Others have covered the answers to most of your questions. However, they are missing a bit about your second example.

a = +b assigns the value of +b to a. The "unary plus" is a no-operation for numeric types, but a compile-time error on other types of objects (for example, you can't use it with a string). It is provided mainly so you can write numbers with a leading + sign when you want to. This is never necessary, but it can improve readability in some circumstances.

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a+=b ========> a=a+b

a=+b ========> a=b

++a will increment the variable and return the incremented value.

a++ will increment the variable but return the value before it was incremented.

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Java operators

a += b;  // a = a + b
a = +b;  // a = b
a++;     // a = a + 1 (returning a if used inside some expression)
++a;     // a = a + 1 (returning a + 1 if used inside some expression)

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Comments
  • In really old versions of C, =+ was equivalent of +=. Dropped for obvious reasons.