实验7

#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; 
            }
} 

#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; 
            }
} 

#include<stdio.h>
#include<stdlib.h>
#define N 10

int main(){
    FILE *r;
    typedef struct student {
    int num;
    char name[20];
    int score;
}STU;
    int i;
    STU st[N];
    r = fopen("file4.dat", "rb");
    if( !r ) { 
        printf("fail to open file4.dat\n");
        exit(0);
    }
    
    for(i=0; i<N; i++) {
        fread(st,sizeof(STU),N,r);
        printf("%-8d %-8s %-8d\n", st[i].num, st[i].name, st[i].score);
    }
    return 0;
}

#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 *r;
    int i;
    r=fopen("examinee.txt","r") ;
    
    for(i=0;i<N;i++)
    {
        fscanf(r, "%ld %s %f %f",&s[i].id ,s[i].name, &s[i].objective, &s[i].subjective);
    }
    fclose(r);
}

void output(STU s[], int n) {
    FILE *w;
    int i;
    w=fopen("result.txt","w"); 
    for(i=0;i< n;i++)
        printf("%-15ld\t%-10s\t%-10.2f\t%-5.2f\t%-5.2f\t%s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
     for(i=0;i< n;i++)
        fprintf(w,"%-15ld\t%-10s\t%-10.2f\t%-5.2f\t%-5.2f\t%s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
    fclose(w);
}


void process(STU s[], int n) {
    int i;
    for(i=0;i<n;i++)
        s[i].sum=s[i].objective+s[i].subjective;
    for(i=0;i<n;i++){
            int j;
            STU temp;
            for(j=i+1;j<=n-1;j++){
                temp=s[j];
                if(s[j].sum>s[i].sum){
                    s[j]=s[i];
                    s[i]=temp;
                }
            }
        }
    
        for(i=0;i<n;i++){
            
            if(i<n/10)
            strcpy(s[i].level,"优秀");
            else if(i<n/2)
            strcpy(s[i].level,"合格");
            else
            strcpy(s[i].level,"不合格"); 
}
}