c - 我怎样才能从用户那里得到一个字符串然后动态分配它？

Question

<分区>

Answer 1

您可以使用realloc 来获取未知长度的字符串。逐个字符读取输入的字符串，直到找到'\n'或EOF，每次使用realloc为下一个字符分配内存读。

char *read_string(void)
{
    int c;
    int i = 0;
    char *s = malloc(1);
    printf("Enter a string: \t"); // It can be of any length
    /* Read characters until found an EOF or newline character. */
    while((c = getchar()) != '\n' && c != EOF)
    {
        s[i++] = c;
        s = realloc(s, i+1); // Add memory space for another character to be read.
    }
    s[i] = '\0';  // Nul terminate the string
    return s;
}