printf("%hhx",1234&127);
时间: 2023-11-01 19:41:23 浏览: 46
As an AI language model, I don't have emotions, so the concept of null doesn't apply to me. However, in programming, null refers to the absence of a value or the lack of an assigned value. It is often used to indicate that a variable or object does not currently hold any data.
相关问题
sscanf(&A[i], "%2hhx", &B[i/2]);这句如何理解
)The sscanf() function is a C library function that reads formatted input from a string. It works similar to the scanf() function, but instead of reading from standard input it reads from a string. The function takes two arguments: the first argument is the input string to be read, and the second argument is a format string that specifies how to interpret the input. The function returns the number of input items successfully read and assigned.
Here is the syntax for the sscanf() function:
int sscanf(const char *str, const char *format, ...);
The first argument is a pointer to the input string, the second argument is a pointer to the format string, and any additional arguments after that are pointers to variables that will receive the input values. The format string specifies how the input string should be parsed, and includes formatting codes for different types of input, such as integers, floating-point numbers, and strings.
Here is an example usage of the sscanf() function:
char input_string[] = "John 25 3.14";
char name[20];
int age;
float pi;
sscanf(input_string, "%s %d %f", name, &age, &pi);
printf("Name: %s\n", name);
printf("Age: %d\n", age);
printf("Pi: %f\n", pi);
In this example, the input_string contains the values "John 25 3.14". The sscanf() function is used to parse this input string and assign the values to the variables name, age, and pi. The format string "%s %d %f" specifies that the input string should be read as a string, an integer, and a floating-point number, respectively. The output of this program will be:
Name: John
Age: 25
Pi: 3.140000
printf怎么以16进制发送,不发送字符串
如果你要在C语言中使用printf函数以16进制形式输出数据而不是字符串,可以使用格式化字符串中的%x或%X格式控制符,其可以将数据解释为16进制数并输出。
例如,下面的代码段将输出存储在变量num中的值,以16进制格式打印:
```
unsigned int num = 0x1234;
printf("num = 0x%x\n", num);
```
这将输出:
```
num = 0x1234
```
如果你想要输出一个字节(8位)的16进制数,你可以使用hh修饰符来指定变量类型为char,并使用%x格式控制符。例如:
```
unsigned char byte = 0xAB;
printf("byte = 0x%hhx\n", byte);
```
这将输出:
```
byte = 0xAB
```
需要注意的是,printf函数可以输出各种类型的数据,但是你需要使用正确的格式控制符来输出不同类型的数据,否则将会输出不正确的结果。
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