The difference between + and ++ in c++

In C, the " " operator is used for numerical addition and string concatenation, while the " " operator is used for variable increment. " " can be used as a postfix or prefix operator. Postfix increment is incremented after returning the result, while prefix increment is incremented before returning the result value.

The difference between neutralization in C

In C, the " " and " " operators have different purposes :

Operator

• Addition: is used to add two values, or add a value to a pointer .
• String concatenation: When used for two strings, concatenates the two strings.
• Unary addition: When used as a unary operator, it increments a value by 1.

Operator

• Postfix increment: As a postfix operator, increments a variable by 1 and then returns its original value.
• Prefix increment: As the prefix operator, increment a variable by 1 and then return its incremented value.

Difference summary

##Operation sequenceIncrement after returning the resultReturn the result after incrementingValue typeMay return a new value or pointerReturn the original value of the variable or after incrementing Value of

Features	Operator	Operator
Basic uses	Numerical addition, string concatenation	Variable increment
One yuan/two yuan	One yuan and two yuan	Only one yuan

Example

// 加法
int sum = 2 + 3; // sum 为 5

// 字符串连接
std::string name = "John" + " Doe"; // name 为 "John Doe"

// 一元加法
int count = 1;
count++; // count 为 2

// 后缀递增
int value = 5;
int result = value++; // result 为 5，value 为 6

// 前缀递增
int score = 10;
int newScore = ++score; // newScore 为 11，score 也为 11

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