What is a string literal in C language?

字符串文字是一个以零结尾的字符序列。例如，

Char * str = "hi, hello"; /* string literal */

字符串字面量用于初始化数组。

char a1[] = "xyz"; /* a1 is char[4] holding {'x','y','z','\0'} */
char a2[4] = "xyz"; /* same as a1 */
char a3[3] = "xyz"; /* a1 is char[3] holding {'x,'y','z'}, missing the '\0' */

如果您尝试更改字符串文字的值，则它们是不可修改的，这会导致未定义的行为。

char* s = "welcome";
s[0] = 'W'; /* undefined behaviour */

始终尝试将字符串文字标记为常量，使用const。

char const* s1 = "welcome";
s1[0] = 'W'; /* compiler error! */

字符串文字也称为字符常量，支持不同的字符集。

/* normal string literal, of type char[] */
   char* s1 = "abc";
/* UTF-8 string literal, of type char[] */
   char* s3 = u8"abc";
/* 16-bit wide string literal, of type char16x[] */
   char16x* s4 = u"abc";
/* 32-bit wide string literal, of type char32x[] */
   char32x* s5 = U"abc";

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