'In C language, what are the similarities and differences between int& and int?'

What is the difference between int& and int in C, specific code examples are needed

In C language, int& and int are two different data types. The difference lies in how the variables are declared and how they are manipulated.

1. Declaration method of variables
   int& is the declaration method of reference type, while int is the declaration method of ordinary variable type.

The following is the declaration method of int& type variables:

int num = 10;
int& ref = num;   // 声明一个引用变量ref，并将其绑定到num变量上

2. Variable operation method
   According to the declaration method of variables, we perform int& and int type variables When operating, there will be different results.

First of all, for variables of type int, we can directly perform assignment and operation operations, for example:

int num1 = 10;
int num2 = 20;

int result = num1 + num2;   // 对两个int类型的变量进行相加运算

And for variables of type int&, it can be regarded as an already The alias of an existing variable, operating on it is actually operating on the original variable. For example:

int num = 10;
int& ref = num;   // 声明一个int&类型的变量ref，并将其绑定到num变量上

ref = 20;   // 修改ref变量的值，实际上就是修改了num变量的值

int result = ref + 30;   // 对ref变量进行运算，实际上就是对num变量进行运算

You can see that for a variable of type int&, it is not an independent storage space, but shares the same storage space with the original variable.

In addition, it should be noted that variables of type int& must be initialized when declared and cannot be rebound to other variables. For example:

int num1 = 10;
int& ref = num1;   // 声明一个int&类型的变量ref，并将其绑定到num1变量上

int num2 = 20;
// ref = num2;   // 错误！无法将int&类型的变量重新绑定到其他变量上

To sum up, the difference between int& and int lies in the way variables are declared and operated. int& is a declaration method of reference type, and operating on it is actually operating on the original variable; while int is an ordinary variable type, and assignment and operation operations can be performed directly.

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