C++ 增加和减少运算符

什么是C ++递增运算符的定义

C ++中的递增运算符是一个一元运算符。递增运算符由符号（++）表示。递增运算符将变量中记录的值加一。此运算符仅适用于数字。

C++递增运算符分为两种类型

• 前递增
• 后递增

1. 后递增运算符（a++）

后缀运算符表示值应先使用，然后递增。这意味着该值首先被用于操作，然后递增一个。

C++代码：

#include 
using namespace std;
int main()
{
    int p = 7;
    cout << " The value before employing the post increment operator is"
            ": "
        << p << endl;
    int temp = p++;
    cout << " The value held by temp is: " << temp
        << endl;
    cout << " The result of applying the post increment operator is: "
        << p << endl;
    return 0;
}

输出

The value before employing the post increment operator is: 7
The value held by temp is: 7
The result of applying the post increment operator is: 8

2. pre-increment运算符（++a）

后缀运算符指定在使用之前对值进行递增。这意味着该值在操作中增加了一，并且然后被变量使用。

C++代码：

#include 
using namespace std;
int main()
{
    int p = 7;
    cout << " The value before employing the pre increment operator is"
            ": "
        << p << endl;
    int temp = ++p;
    cout << " The value held by temp is: " << temp
        << endl;
    cout << " The result of applying the pre increment operator is: "
        << p << endl;
    return 0;
}

输出

The value before employing the pre increment operator is: 7
The value held by temp is: 8
The result of applying the pre increment operator is: 8

什么是C++减法运算符

C++中的减法运算符是一元运算符。减法运算符用符号(-)表示。减法运算符将变量的值减一。该运算符仅适用于数字。

C++减法运算符分为两种类型

• 后减法运算符
• 前减法运算符

1. 后减法运算符 (a–)

后缀运算符表示先使用值，然后再减少。这意味着值先用于操作，然后减少一。

C++ 代码：

#include 
using namespace std;
int main()
{
    int p = 7;
    cout << " The value before employing the post decrement operator is"
            ": "
        << p << endl;
    int temp = p--;
    cout << " The value held by temp is: " << temp
        << endl;
    cout << " The result of applying the post decrement operator is: "
        << p << endl;
    return 0;
}

输出

The value before employing the post decrement operator is: 7
The value held by temp is: 7
The result of applying the post decrement operator is: 6

2. 前置递减运算符 (–a)

后置递减运算符指示在使用之前应该减小数值。这意味着数值在操作时减一，并且变量会使用这个减小后的数值。

C++代码：

#include 
using namespace std;
int main()
{
    int p = 7;
    cout << " The value before employing the pre decrement operator is"
            ": "
        << p << endl;
    int temp = --p;
    cout << " The value held by temp is: " << temp
        << endl;
    cout << " The result of applying the pre decrement operator is: "
        << p << endl;
    return 0;
}

输出

The value before employing the pre decrement operator is: 7
The value held by temp is: 6
The result of applying the pre decrement operator is: 6