我想控制文件指针的位置 [英] I want to control file pointer location

问题描述

我想找到重复的整数并将其位置替换为空白.这是我的功课.但是我没有解决这个问题. 我的代码是

I want to find the repeated integers and replace their positions with empty space. This is my homework. But I didn't solve this problem. My code is

int main(){

    int control_integer;
    int temp_integer;
    int flag = 0;
    int location;
    char space = ' ';
    char control_end_of_file;

    FILE *fp,*tp;

    fp = fopen("file.txt","r+");

    while(!feof(fp))
    {

        fscanf(fp,"%d",&control_integer); 
        printf("control_integer: %d\n",control_integer );

        while(!feof(fp)){

            fscanf(fp,"%d",&temp_integer);
            printf("temp_integer = %d\n",temp_integer );

            if (temp_integer == control_integer)
            {
                flag = 1;
                printf("girdi integer: %d\n",temp_integer );
                fprintf(fp, "  %c ",space );
            }
        }
    }
    return 0;
}

我按以下方式计划了我的职能.首先，我在文件中添加一个元素，然后转到新的循环并查看下一个元素.如果相等，我想用一个空格代替它.但是问题就在这里. * fp，当执行读取操作时，下一个元素被传递，但是我想防止它并向该位置写入其他内容.因此，我想在同一位置进行写入和删除操作.我尝试了一些东西，但是做不到.

I planned my function as follows. First I take an element in the file, then I go to a new loop and look at the next elements. If it is equal, I want to replace it with a space. But the problem arises right here. * fp, when the reading operation is performed, the next element is passed but I want to prevent it and write something else to that location. So I want to do both write and delete in the same place. I tried something, but I couldn't do it.

推荐答案

首先，我在文件中添加一个元素，...

First I take an element in the file,...

我认为在这种情况下int x; x = getc()就足够了.例如:

I think in this case int x; x = getc() is enough. E.g.:

while((x = getc(fp)) != EOF){printf("do something");};

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