实验七

Part1: 验证性实验 验证性实验2

正确

验证性实验3

// 从文本数据文件file1.dat中读入数据，按成绩从高到低排序，将排序结果输出到屏幕上，同时以文本方式存入文件file3.dat中。
#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("file3.dat", "w");
    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);
        fprintf(fout, "%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score);
    }
        
    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; 
            }
    
    
} 

可读

 

 

验证性实验4：

// 从文本数据文件file1.dat中读入数据，按成绩从高到低排序，并将排序结果输出到屏幕上，同时，也以二进制方式存入文件file4.dat中。
#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; 
            }
    
    
} 

不可读

 

Part2: 编程练习

#include <stdio.h>
#include <string.h>
#include <stdlib.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==NULL){
         printf("fail to open examinee.txt\n");
         exit(0);
     }
     for(i=0;i<n;i++)
     fscanf(fin,"%ld %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;
     fout=fopen("result.txt","w");
     if(fout==NULL){
         printf("fail to open result.txt\n");
         exit(0);
     }
     for(i=0;i<n;i++){
     printf("%-6ld %-8s %-10.2lf %-12.2lf %-12.2lf %-3s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
     fprintf(fout,"%-6ld %-8s %-10.2lf %-12.2lf %-12.2lf %-3s\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(i=0;i<n;i++){
    for(j=0;j<n-1-i;j++){
        if(s[j].sum<s[j+1].sum){
            temp=s[j+1];
            s[j+1]=s[j]; 
            s[j]=temp;
        }
    }
}
    for(i=0;i<n;i++){
        if((i+1)<=0.1*n)
        strcpy(s[i].level,"优秀");
        else if((i+1)>0.5*n)
        strcpy(s[i].level,"不合格");
        else
        strcpy(s[i].level,"合格");
        
    }
}

 

 

转载于:https://www.cnblogs.com/qwer9107/p/11079700.html