文件操作练习

#include <cstdio>
#include <iostream>

using namespace std;

struct stu
{
    char num[5];
    char name[11];
    int base;
    int oper;
    int total;
}a[100],t;

int main()
{
    int i,j,k,temp1,temp2;
    FILE *fp;
    if((fp=fopen("in1.dat","r"))==NULL)
    {
        printf("文件打开失败\n");
        exit(0);
    }
    for(i=0;i<100;++i)
    {
        fscanf(fp,"%s",a[i].num);
        fscanf(fp,"%s",a[i].name);
        fscanf(fp,"%d",&a[i].base);
        fscanf(fp,"%d",&a[i].oper);
        fscanf(fp,"%d",&a[i].total);
        a[i].total=a[i].base+a[i].oper;
    }
    for(i=99;i>=0;--i)
    {
        for(j=0;j<i;++j)
        {
            if(a[j].total<a[j+1].total)
            {
                t=a[j];
                a[j]=a[j+1];
                a[j+1]=t;
            }
            else if(a[j].total==a[j+1].total)
            {
                temp1=temp2=0;
                for(k=0;k<4;++k)
                {
                    temp1*=10;
                    temp1+=a[j].num[k]-'0';
                    temp2*=10;
                    temp2+=a[j+1].num[k]-'0';
                }
                if(temp2<temp1)
                {
                    t=a[j];
                    a[j]=a[j+1];
                    a[j+1]=t;
                }
            }
        }
    }

    for(i=0,j=0;i<100;++i)
    {
        if(j==10)
            break;
        if(a[i].base>=10&&a[i].oper>=10)
        {
            ++j;
            printf("%s\t%s\t%d\t%d\t%d\n",a[i].num,a[i].name,a[i].base,a[i].oper,a[i].total);
        }
    }
    fclose(fp);
    return 0;
}