实验七

任务4：

源代码：

# include<stdio.h>
 int main()
 {
     FILE *p;
     char ch;
     int cnt_zf=0,cnt_hs=1;
     p=fopen("D:/democ.1/data4.txt","r");
     if(!p)
     printf("fail to open");
     while((ch=fgetc(p))!=EOF)
    {
     if(ch!=' '&&ch!='\n'&&ch!='\t')
      cnt_zf++;
     else if(ch=='\n')
     cnt_hs++; 
 }
   fclose(p);
  printf("字符个数:%d\n",cnt_zf);
  printf("行数:%d\n",cnt_hs);
  return 0;
 }

运行结果：

任务五：

源代码：

# include<stdio.h>
# include<string.h>
# define N 10
typedef struct{
    long id;
    char name[20];
    float objective;
    float subjective;
    float sum;
    char result[10];
}STU;
void read(STU st[],int n);
void write(STU st[],int n);
void output(STU st[],int n);
int process(STU st[],int n,STU st_pass[]);
int main(){
    STU stu[N],stu_pass[N];
    int cnt ;
    double pass_rate;
    printf("从文件中读入%d个考生信息...\n",N);
    read(stu,N);
    printf("\n对考生成绩进行统计....\n");
    cnt=process(stu,N,stu_pass);
    printf("\n通过考试的名单:\n");
    output(stu,N);
    write(stu_pass,cnt);
    pass_rate=1.0*cnt/N;
    printf("\n本次等级考试通过率:%.2f%%\n",pass_rate*100);
    return 0;
}
void read(STU st[],int n)
{
    int i;
    FILE *fin;
    fin=fopen("D:\\实验7数据文件及部分代码\\实验7数据文件及部分代码\\examinee.txt","r");
    if(!fin){
    printf("fail to open");
    return;    
}
while(!feof(fin))
{
    for(i=0;i<n;i++)
    fscanf(fin,"%ld %s %f %f",&st[i].id,st[i].name,&st[i].objective,&st[i].subjective);
}
fclose(fin);
}

void output(STU st[],int n)
{
    int i;
    printf("准考证号\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++)
      printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
}

void write(STU st[],int n)
{
    FILE *p;
    int i;
    p=fopen("list_pass.txt","w");
    if(!p)
    {
        printf("fail to open");
        return;
    }
    fprintf(p,"%s\t%s\t\t%-10s\t\t%s\t\t%s\t\t  %10s\n","准考证号","姓名","客观题得分","操作题得分","总分","结果");
      for(i=0;i<n;i++)
        fprintf(p,"%ld\t\t%-10s\t%.2f\t\t%.2f\t\t%.2f\t\t%-10s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
    fclose(p);
}
int process(STU st[],int n,STU st_pass[])
{
    
    int i,cnt=0;
    for(i=0;i<n;i++)
{
      st[i].sum=st[i].objective+st[i].subjective;
      if(st[i].sum>=60)
      strcpy(st[i].result,"通过"),st_pass[cnt++]=st[i];
      else
      strcpy(st[i].result,"不通过");    
}
     return cnt;
}

运行结果：

任务六：

源代码：

# include<stdio.h>
# include<stdlib.h>
# include<time.h>
typedef struct{
    long id;
    char name[80];
    char class[80];
}STU;
int main()
{
    long wj=0;
    STU x[80];
    int i,s[5],m,b=1,cnt=0;
    FILE *p;
    p=fopen("D:\\实验7数据文件及部分代码\\实验7数据文件及部分代码\\list.txt","r");
    if(!p)
{    printf("fail to open");
    return 1;
}
   for(i=0;i<80;i++)
        fscanf(p,"%ld%s%s",&x[i].id,x[i].name,x[i].class);
    srand(time(NULL));
    for(cnt=0;cnt!=5;){
        m=rand()%80;
        for(i=0;i<cnt;i++)
        if(m==s[i])
        b=-1;
        if(b!=-1)    
        s[cnt++]=m,b=1;    
         }    
 for(i=0;i<5;i++)   
 printf("%-30ld %-30s %-30s\n",x[s[i]].id,x[s[i]].name,x[s[i]].class); 
 FILE *new;
 new=fopen("20241230.txt","w");
 if(!new){
 printf("fail to open");
 return 1;
}
for(i=0;i<5;i++)
fprintf(new,"%-30ld %-30s %-30s\n",x[s[i]].id,x[s[i]].name,x[s[i]].class);
fclose(p);
fclose(new);
return 0;
}




 

运行结果：