在文件中查找两个最大值和两个最小值

Question

正如我的项目所述，我需要创建一个程序来读取文件并找到文件中最大和最小值中的2个。这是我的程序，它似乎找到了最大和最小，但确实得到了第二大和最小。两个小和两个大的fscanf似乎没有从文件中获取值，因此我也得到了答案的随机值。我不知道什么是错的，如果你能告诉我什么是错的那就太棒了。

#include <stdio.h>

int
main (void)
{
    FILE *in;     /*names the file*/
    int onesmall, twosmall, compare, onebig, twobig;

    in = fopen("file2.data", "r");    /*opening the file*/
    fscanf(in,"%d", &onesmall);    /*scans and inputs first value (lowest value as of now)*/
    fscanf(in,"%d", &onebig);
    fscanf(in,"%d", &twobig);
    fscanf(in,"%d", &twosmall);
    while(!feof(in)){         /*loops till reaches to end of file*/
        fscanf(in,"%d", &compare);     /*scans and inputs first value*/
        if (compare <= onesmall){
            onesmall = compare;   /*checks if value in compare is smaller than value in onesmall if it is then it will relace it*/
        }
        if (compare >= onebig){
            onebig = compare;  /*checks if value in compare is greater than value in onebig if it is then it will relace it*/
        }
    }

    while(!feof(in)){
        fscanf(in,"%d",&compare);
        if (compare <= twosmall && compare != onesmall){   /*if value in compare is smaller than twosmall and not eaual to onsmall replace it*/
            twosmall = compare;
        }
        if(compare >= twobig && compare != onebig){   /*if value in compare is greater than twobig and not eaual to onebig replace it*/
            twobig = compare;
        }
    }
    printf("The lowest value in the file is: %d\n", onesmall);
    printf("The second lowest value in the file is: %d\n", twosmall);
    printf("The greatest value in the file is: %d\n", onebig);
    printf("The second greatest value in the file is: %d\n", twobig);  /*prints output*/

    fclose(in);
    return (0);
}