实验7

实验三、

正确由高到低排序，生成了file3.dat，数据信息正确且可观

实验四、

1.正确分数由高到低排序，生成file4.dat，数据信息不直观可读

2.

#include <stdio.h> 
#include <stdlib.h>
 #define N 10 
 typedef struct student { 
 int num;
  char name[20];
   int score;
    }STU;
     void sort(STU *pst, int n);
      int main() { 
      FILE *fin, *fout; 
      STU st[N];
       int i; 
        fin = fopen("file1.dat", "r"); 
        if( !fin ) {
         printf("fail to open file1.dat\n"); exit(0); }
for(i=0; i<N; i++) 
fscanf(fin, "%d %s %d", &st[i].num, st[i].name, &st[i].score); 
fclose(fin); 
sort(st, N); 
 fout = fopen("file4.dat", "wb"); 
 if( !fout ) {
   printf("fail to open file1.dat\n"); 
   exit(0);
    }
    for(i=0; i<N; i++) 
    printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score);
      fwrite(st, sizeof(STU), N, fout); 
       fclose(fout); 
        return 0;
         }
          void sort(STU *pst, int n)
           { STU *pi, *pj, t; 
           for(pi = pst;
            pi < pst+n-1;
             pi++) 
for(pj = pi+1; 
pj < pst+n; pj++) 
if(pi->score < pj->score) { 
t = *pi; 
*pi = *pj;
 *pj = t; 
 } 
 }

 

 实验五

#include <stdio.h>
#include <string.h>
const int N = 10;
typedef struct student {
    long int id;
    char name[20];
    float objective;   
    float subjective;  
    float sum;
    char level[10];
}STU;
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);
 
int main() {
    STU stu[N];
     
    printf("录入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N);
    input(stu, N);
     
    printf("\n对考生信息进行处理: 计算总分，确定等级\n");
    process(stu, N);
     
    printf("\n打印考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级\n");
    output(stu, N);
     
    return 0;
}
void input(STU s[], int n) {
FILE*fin;
int i;
fin=fopen("examinee.txt","r") ;
if( !fin ) {
        printf("fail to open examinee.txt\n");
    }
    for(i=0; i<=N; i++) {
        fscanf(fin,"%d%s%f%f",&s[i].id,&s[i].name,&s[i].objective,&s[i].subjective);
    }
    fclose(fin);
}
void output(STU s[], int n) {
FILE*fout;
int i;
    for(i=0; i<N; i++) {
        printf("%ld %s %12.1f %12.1f %12.1f %8s\n", s[i].id, s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
    }
fout=fopen("result.txt","w") ;
if( !fout ) {
        printf("fail to open result.txt\n");
    }
        for(i=0; i<N; i++) {
        fprintf(fout,"%ld %12.2s %12.1f %12.1f %12.1f %8s\n", s[i].id, s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
         
    }
    fclose(fout);
}
void process(STU s[], int n) {
    int i,j;
    STU temp;
    for(i=0;i<n;i++)
    s[i].sum=s[i].objective+s[i].subjective;
for(j=0;j<n-1;j++){
    for(i=0;i<n-1-j;i++){
        if(s[i].sum<s[i+1].sum){
        temp=s[i+1];
        s[i+1]=s[i];
        s[i]=temp;
        }
    }
}
    for(i=0;i<n;i++){
        if(s[i].sum>=s[n/10].sum)
        strcpy(s[i].level,"优秀");
        if(s[i].sum>=s[n/2].sum&&s[i].sum<s[n/10].sum)
        strcpy(s[i].level,"合格");
        if(s[i].sum<s[n/2].sum)
        strcpy(s[i].level,"不合格");
    }  
}