sscanf()赋值给uint8-t
时间: 2023-07-06 12:08:46 浏览: 193
可以将 sscanf() 函数返回的结果强制转换为 uint8_t 类型来进行赋值操作,例如:
```c
#include <stdio.h>
#include <stdint.h>
int main() {
char str[] = "255";
uint8_t val;
sscanf(str, "%hhu", &val);
printf("val = %u\n", val);
return 0;
}
```
在这个例子中,使用 `%hhu` 格式说明符将字符串中的字符转换为无符号 8 位整数,并将结果存储在 `val` 变量中。由于 `val` 是一个 uint8_t 类型,因此会发生隐式类型转换。如果输入的字符串不符合无符号 8 位整数的格式,那么 `sscanf()` 函数将返回失败,程序可能会出现错误。
相关问题
strtok uint8_t
strtok is a string manipulation function in C that is used to tokenize a string into smaller parts based on a delimiter. It is not specific to the uint8_t data type, as it operates on strings.
The uint8_t type is an unsigned integer type with a size of 8 bits (1 byte). It is typically used to represent values ranging from 0 to 255.
If you want to tokenize a string containing uint8_t values, you can use strtok to separate the values based on a delimiter and then convert each token to uint8_t using the appropriate conversion function, such as atoi or sscanf.
Here's an example:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int main() {
char str[] = "10,20,30,40";
char *token;
uint8_t value;
token = strtok(str, ",");
while (token != NULL) {
value = (uint8_t) atoi(token); // Convert token to uint8_t
printf("%u\n", value);
token = strtok(NULL, ",");
}
return 0;
}
```
In this example, the string "10,20,30,40" is tokenized using the delimiter ",". Each token is converted to uint8_t using the atoi function and then printed.
C语言字符串转为16进制uint8_t数组
下面是一个示例代码,将字符串转换为16进制uint8_t数组:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int main() {
char str[] = "Hello World";
uint8_t hex_array[strlen(str)/2 + 1];
int i, j;
for (i = 0, j = 0; i < strlen(str); i += 2, j++) {
sscanf(&str[i], "%02x", &hex_array[j]);
}
hex_array[j] = '\0';
printf("Original string: %s\n", str);
printf("Hex array: ");
for (i = 0; i < strlen(str)/2; i++) {
printf("%02x ", hex_array[i]);
}
printf("\n");
return 0;
}
```
在上面的示例中,我们首先声明了一个字符串变量 `str`,然后声明一个 uint8_t 类型的数组 `hex_array`,用于存储转换后的16进制值。然后我们使用 `sscanf` 函数将字符串中每两个字符转换为一个16进制数,并存储到 `hex_array` 数组中。最后,我们打印了原始字符串和转换后的16进制数组。
需要注意的是,如果字符串的长度为奇数,则我们将忽略最后一个字符。
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