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How to express √ in C language

May 07, 2024 am 07:00 AM
c language

C 语言中表示 √ 符号的方法:转义字符:"\u221A"转义序列:"\u221A"特殊字符常量:sqrt(2)(C99 标准)行内汇编:'\u221A'(需要头文件支持)第三方库:ncurses 库

How to express √ in C language

C 语言中 √ 的表示方法

C 语言中,可以使用以下方法来表示 √ 符号:

使用转义字符

printf("\u221A");

在这里,"\u221A" 是 √ 符号的 Unicode 字符编码。

使用转义序列

printf("\\u221A");

这种方法与使用转义字符类似,只是需要在字符编码前加上一个反斜杠 ()。

使用特殊字符常量

C99 标准引入了一个特殊的字符常量,可以表示 √ 符号:

printf("%c", sqrt(2));

其中,sqrt(2) 是数学库中计算平方根的函数,返回一个浮点数。C99 标准规定,当将浮点数转换为字符时,它将被截断为整数,表示平方根符号 √。

使用行内汇编

在某些情况下,可以使用行内汇编直接插入 √ 符号:

int main() {
  printf("%c", '\u221A'); // 需要包含需要的头文件
  return 0;
}

x86 架构中,可以将字符编码直接加载到 eax 寄存器中,然后使用 int 0x80 汇编指令调用系统写函数。

使用第三方库

还有一些第三方库可以提供 √ 符号的表示法,例如 ncurses 库。

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