实验7 文件应用编程

task4

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdlib.h>
#include<stdio.h>
#define N 100
int main()
{FILE *fp;
char n,*p;
int count=0; 
fp=fopen("data4.txt","r");
while(feof(fp)==0)
{
n=fgetc(fp);
if(n!=' '&&n!='    '&&n!='\n')
{count++;}
}
count--;
printf("%d",count);
system("pause");
return 0;
}

task5

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void foutput(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 保存到文件 
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open or create list_pass.txt\n");
        exit(0);
    }
    
    fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");

    for (i = 0; i < n; i++)
        fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].ans);

    fclose(fout);
}



// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
   int i,k=0;
    for(i=0;i<n;i++)
    {
        st[i].sum=st[i].objective+st[i].subjective;
        if(st[i].sum>=60)
            {strcpy(st[i].ans,"通过");
            st_pass[k].id=st[i].id;
            strcpy(st_pass[k].name,st[i].name);
            strcpy(st_pass[k].ans,st[i].ans);
            st_pass[k].objective=st[i].objective;
            st_pass[k].subjective=st[i].subjective;
            st_pass[k].sum=st[i].sum;
            k++;
            }
        else
            strcpy(st[i].ans,"不通过");
    }
    return k;
}

task6

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdlib.h>
#include<stdio.h>
#include<time.h>
struct stu
{
long long int id;
char name[20];
char information[40];
}st[80];

int main()
{
int i,x;
FILE *fp;
FILE *p;
p=fopen("lucky.txt","w");
fp=fopen("list.txt","r");

for(i=0;i<80;i++)
{
fscanf(fp,"%lld %s %s",&st[i].id,st[i].name,st[i].information);
}

for(i=1;i<=5;i++)
{
srand(time(0)*i);
x=rand()%80;
printf("%lld %-7s %-10s\n",st[x].id,st[x].name,st[x].information);
fprintf(p,"%lld %-7s %-10s\n",st[x].id,st[x].name,st[x].information);
}
fclose(fp);
fclose(p);
system("pause");
return 0;
}