说我有char
喜欢:
char a = 'a';
如何将其转换为以下内容:
char* b = "a";
// b = {'a', '\0'};
(技术上2 char
s,因为它应该为空终止)
我的用例是三元表达式,我想将'\0'
转换为"\\0"
({ '\\', '0', \0' }
),但其他每个字符都是一个字母,我想保留同样的。
letter == '\0' ? "\0" : letter;
这样可行,但会产生关于不匹配类型的错误。我还有其他可能需要用的东西。
我尝试过的事情:
letter == '\0' ? "\\0" : letter;
// error: pointer/integer type mismatch in conditional expression [-Werror]
letter == '\0' ? "\\0" : { letter, '\0' };
// ^
// error: expected expression before ‘{’ token
letter == '\0' ? "\\0" : &letter;
// No error, but not null terminated.
letter == '\0' ? "\\0" : (char*) { letter, '\0' };
// ^~~~~~
// error: initialization makes pointer from integer without a cast [-Werror=int-conversion]
//
// ter == '\0' ? "\\0" : (char*) { letter, '\0' };
// ^~~~
// error: excess elements in scalar initializer [-Werror]
// Seems to want to initialise a char* from just the first thing in the list
char string[2] = {letter, 0};
letter == '\0' ? "\\0" : string;
// Makes a string even if it is `'\0'` already. Also requires multiple statements.
char string[2];
letter == '\0' ? "\\0" : (string = {letter, 0});
// ^
// error: expected expression before ‘{’ token
答案 0 :(得分:5)
最短的
char c = 'a';
char s[2] = {c}; /* Will be 0-terminated implicitly */
puts(s);
打印:
a
如果它只是能够将角色传递给puts()
(或类似),你甚至可以使用复合文字
puts((char[2]){c});
或
{
puts((char[2]){c});
}
后者立即释放复合文字使用的内存。
两者都打印
a
。
答案 1 :(得分:0)
char str[2] = "\0";
str[0] = c;
你很高兴。
当然,如果这是一个带编码的值,那么你可以这样做:
char str[2] = "a";