C-字串常量

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相同的字串常量是共用的，而且是不可寫的。

 1 #include <iostream> 2 using namespace std; 3  4 char *string1, *string2; 5  6 int main() { 7     string1 = "abcd"; string2 = "abcd"; 8     if(string1 == string2) printf("strings are shared!\n"); 9     else printf("strings are NOT shared!\n");10     //有可能執行階段錯誤11     //string1[0] = ‘1‘;12     if(*string1 == ‘1‘) printf("string are writable!\n");13     else printf("string are NOT writable!\n");14 15     return 0;16 }

輸出：

$ ./a.exestrings are shared!string are NOT writable!