Question

您好我使用strtok分割我使用fgets从文件读入的一行。我很想知道如何使用if语句检查该行的每个分区。

文件中的一行就像是

1 FirstName-LastName

char *stuff;
while(fgets(buffer, sizeof(buffer), myfile)){
    stuff = strtok(buffer, " ");// this should give me 1
    if( ...... ) // what would be the correct way of saying if stuff == "1"

Answer 1

==实际上只对比较整数值有用。使用strcmp()或strstr()之类的字符串进行比较。

这样的事情。 （请参阅嵌入的评论以获得一些解释......）

char *stuff;
char keep[260];// or some reasonable size to do your comparison.  
               //its best not to use your token to do anything except store the token :)
while(fgets(buffer, sizeof(buffer), myfile))
{
    stuff = strtok(buffer, " ");// this should give me 1
    while(stuff) // as long as stuff not NULL
    {
        strcpy(keep, stuff);//
        if(strcmp(keep, "1") == 0)  //strtok returns only (char *) and output of strcmp is 0 for equal
        {
            //do something here!
        }
        //get next token
        stuff = strtok(NULL, " ");
    }
}

指向字符串的指针的条件（if语句）

1 个答案: