c - C 中 strcmp() 的问题

Question

char* mystr = calloc(25, sizeof(char));
fgets(mystr, 25, stdin); // I enter "6 7 *" in here, without the quotes

char* tok;
tok = strtok(mystr, " ");
while (tok != NULL) {
    if(strcmp(tok, "*") == 0)
        //It never meets this condition, but I don't understand why
    else
        //do something else here
    tok = strtok(NULL, " ");
}

问题是 strcmp(tok, "*") 永远不会返回相等的结果，即使 tok 从原始字符串中读入星号。我不明白为什么它永远不会满足这个条件。

Answer 1

您的 * token 可能还包含您为完成输入而键入的 \n 字符。将单个字符与以下之一进行比较:

  if(tok[0] == '*')

  if(strncmp(tok, "*", 1) == 0)

或将 \n 添加到您的分隔符列表:

  tok = strtok(NULL, " \n");