12.24

#include<stdio.h>
#include<stdlib.h>

int main(){ 
    FILE *fin, *fout;
    char ch;
    
    fin = fopen("1.txt","r");
    if(fin == NULL){
        printf("fail to open 1
");
        exit(0);
    }
    
    fout = fopen("2.txt","w");//如果加上了路径就会在所给路径中创建。 
    if(fout == NULL){
        printf("fail to open 2
");
        exit(0);
    }
    
    while(!feof(fin)){
        ch = fgetc(fin);//fscanf(fin,"%c",&ch);可以改为这个 
        
        if(ch >= 'a' && ch <= 'z'){
            ch = ch - 32;
        }
        
        fputc(ch,fout);//fprintf(fout,"%c",ch);可以改为这个 
    }
    
    fclose(fin);
    fclose(fout);
    
    return 0;
} 

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct student{
    
    long num;
    char name[20];
    int score;
    
}STU;

#define len sizeof(STU)
#define N 10
int main(){
    FILE *fp;
    fp = fopen("3.txt","r");
    
    if(fp == NULL){
        printf("fail to open 3");
        exit(0);
    }
    
    STU s;
    int i;
    
    STU stmax ,stmin;
    for(i = 0 ; i < N ; i++){ //稍作修改能改为while 
        if(i == 0){
            
            fscanf(fp, "%d %s %d", &s.num ,s.name,&s.score);
            stmin = s;
            stmax = s;
            
        }
        else{
            
            fscanf(fp, "%d %s %d", &s.num ,s.name,&s.score);
            if(s.score < stmin.score)
            stmin = s;
            
            else if (s.score > stmax.score)
            stmax = s;
            
        
            
        }
    }

    fclose(fp);
    
    printf("最高分学生信息： %5d%15s%5d
", stmax.num ,stmax.name , stmax.score );
    printf("最低分学生信息： %5d%15s%5d
", stmin.num ,stmin.name , stmin.score );

    return 0;
    
}

#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("3.txt","r");
    
    if(fin == NULL){
        printf("fail to open 3
");
        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("4.txt","w");;
        if(fout == NULL){
            printf("fail to open 4");
            exit(0);
        }
        
        for( i = 0 ; i < N ; i++){
            printf("%-6d%-10s%3d
",st[i].num ,st[i].name,st[i].score);
            fprintf(fout,"%-6d%-10s%3d
",st[i].num ,st[i].name,st[i].score);  
        }
        
        fclose(fout);
        
        return 0;
} 

void sort(STU *pst, int n){
    STU *pi,*pj,t;
    
    for(pj = 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 s[], int n);
int main(){
    FILE *fp1, *fp2,*fp3;
    STU s[N];
    int i;
    
    fp1 = fopen("3.txt","r");
    if(fp1 == NULL){
        printf("fail to open3
");
        exit(0);
    }
    for( i = 0 ;i < N; i++)
        fscanf(fp1,"%d %s %d",&s[i].num,s[i].name,&s[i].score);
    
    fclose(fp1);
    
    sort(s,N);
    
    fp2 = fopen("5.txt","wb");
    
    for(i = 0 ; i < N ; i++){
        printf("%d   %s   %d
 ",s[i].num, s[i].name, s[i].score);
        fwrite(&s[i], sizeof(STU),1,fp2);
        
    }
    fclose(fp2);
    
    printf("
");
    
    fp3 = fopen("5.txt","rb");
    
    if(fp3 == NULL){
        printf("fail to open
");
        exit(0);
    }

    for(i = 0 ; i< N; i++){
        fread(&s[i],sizeof(STU),1,fp3);
        printf("%d   %s    %d
",s[i].num,s[i].name,s[i].score);
    }
    
    fclose(fp3);
    
    return 0;
    
}

void sort(STU s[], int n){
    int i, j,min;
    STU temp;
    for( i = n - 1; i > 0; i--){
        j = i - 1;
        min = s[i].score;
        for(;j >= 0 ;j--){
            if(s[j].score < min){
                min = s[j].score;
                temp = s[i];
                s[i] = s[j];
                s[j] = temp;
            }
        }
    }
}

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

#define N 10

typedef struct student{
    int num;
    char name[20];
    float kg;
    float zg;
    float sum;
    char level[10];
}STU; 

int main(){
    FILE *fin, *fout;
    int i,j, perfect, pass,min;
    STU s[N];
    
    fin = fopen("6.txt","r");
    if(fin == NULL){
        printf("fail to open 6.txt
");
        exit(0);
    }
    
    for(i = 0 ; i < N; i++){
        fscanf(fin,"%d %s %f %f",&s[i].num ,s[i].name, &s[i].kg ,&s[i].zg );
        s[i].sum = s[i].kg  + s[i].zg;
    }
    fclose(fin);
    
    STU temp;
    for(i = N - 1 ;i > 0 ; i--){
        j = i - 1;
        min = s[i].sum;
        
        for( ; j >= 0;j--){
        
            if( s[j].sum < min){
                min = s[j].sum;
                temp = s[i];
                s[i] = s[j];
                s[j] = temp;
            }
        
        }
    
    }
    
    perfect = N * 0.1;
    pass = N * 0.5;
    for(i = 0 ; i < N ;i++){
        if(i < perfect ){
            strcpy(s[i].level , "优"); 
        }
        else if(i < pass){
            strcpy(s[i].level , "合格"); 
        }
        else{
            strcpy(s[i].level , "不合格"); 
        }
    }
    
    fout = fopen("7.txt","w");
    if(fout == NULL){
        printf("fail to open 7.txt
");
        exit(0);
    }
    
    for( i = 0 ; i < N; i++){
        fprintf(fout, "%-6d%-15s%-8.2f%-8.2f%-8.2f%-10s
",s[i].num,s[i].name,s[i].kg,s[i].zg,s[i].sum,s[i].level);
        printf("%-6d%-15s%-8.2f%-8.2f%-8.2f%-10s
",s[i].num,s[i].name,s[i].kg,s[i].zg,s[i].sum,s[i].level);
        
    }
    fclose(fout);
    
    return 0;
}

#include<stdio.h>
#include<time.h>
#include<stdlib.h>

#define N 5

typedef struct student{
    int num;
    int num1;
    char name[20];
    int class1;
    
}STU;

int main(){
    FILE *fin, *fout;
    STU s[12];
    int a[N + 1];
    a[0] = 0;
    int i , j, c;
    
    for( i = 1 ; i <= N ;i++){
        
        do{
            
            srand(time(0));
            a[i] = rand() % 13;
            for( j = 0 ; j < i ;j++){//确保抽到的人不重复 
                c = 0;
                if(a[i] == a[j]){
                    c = 1;
                    break;
                }
            }
        }while(c);
    }
    

    
    fin = fopen("8.txt","r");
    if( fin == NULL){
        printf("fail to open 8.txt");
        exit(0);
    }
    
    for( i = 0 ; i < 12; i++){
        fscanf(fin, "%d %d %s %d",&s[i].num ,&s[i].num1, s[i].name,&s[i].class1);
        
    }
    fclose(fin);
    
    fout = fopen("9.txt","w");
    if(fout == NULL){
        printf("fail to open 9.txt
");
        exit(0);
    }
    
    for( i = 0; i < 12 ;i++){
        for(j = 1 ;j <= N; j++)
        {
            c = 0;
            if(s[i].num == a[j]){
                c = 1;
                break;
            }
        }
        if(c){
            printf("%d %5d %-15s %d
",s[i].num,s[i].num1,s[i].name,s[i].class1);
            fprintf(fout,"%d %5d %-15s %d
",s[i].num,s[i].num1,s[i].name,s[i].class1);
        }
    }
    fclose(fout);
    
    return 0;
}

实验四两个实验合在一起了，实验五打完了才发现老师有给代码，实验六随机数生成的很慢，以及整个实验无法正常的读入中文，待解决。