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实验7

时间:2024-12-29 15:19:50浏览次数:4  
标签:int st STU 实验 printf t% fin

test4.c

#include <stdio.h>

void read();

int main(){
    read();
    return 0;
}

void read(){
    FILE *fp;
    char ch;
    int cnt=0;
    int linecnt=1; 
    fp=fopen("data4.txt","r");
    if(fp==NULL){
        printf("fail to open file to read\n");
        return;
    }
    while((ch=fgetc(fp))!=EOF){
        if(ch==' '||ch=='\t'||ch=='\n'){
            if(ch=='\n'){
                linecnt++;
            }
        }else{
            cnt++;
        }
    }
    fclose(fp);
    printf("data4.txt统计结果:\n");
    printf("行数:%-40d\n",linecnt);
    printf("字符数(不计空白符):%-40d\n",cnt);
    
}

 

test5.c

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

#define N 10

typedef struct {
    long id;            // 准考证号
    char name[20];      // 姓名
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char result[10];    // 考试结果
} STU;

// 函数声明
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);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把所有考生完整信息输出到屏幕上
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
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);
}

// 从文本文件examinee.txt读入考生信息:准考证号,姓名,客观题得分,操作题得分
void read(STU st[], int n) {
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        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);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
void write(STU s[], int n) {
    int i;
    FILE *fp;
    fp = fopen("list_pass.txt", "w");
    if(!fp){
        printf("fail to open file\n");
        return;
    }
    for(i=0;i<n;i++){
        if(s[i].sum>=60){ 
        fprintf(fp,"%ld\t\t%-10s\t%.2f\t\t%.2f\t\t%.2f\t\t%-10s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
        } 
    }
    fclose(fp);
}
// 对考生信息进行处理:计算每位考生考试总分、结果;统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
    int cnt=0;
    int i,j=0;
    for(i=0;i<n;i++){
        st[i].sum=st[i].objective+st[i].subjective;
        if(st[i].sum>=60){
            cnt++;
            strcpy(st[i].result,"通过");
            st_pass[j]=st[i];
            j++;
        }
        else{
            strcpy(st[i].result,"不通过");
        }
    }
    return cnt;
}

 

test6.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80

typedef struct{
    int id;
    char name[20];
    char class[40];
}STU;

void read(STU fomer[]){
    int i;
    FILE *fin;
    fin = fopen("list.txt","r");
    if(!fin){
        printf("fail to open file\n");
        return;
    }
    while(!feof(fin)){
        for(i=0;i<N;i++){
            fscanf(fin,"%d %s %s",&fomer[i].id,fomer[i].name,fomer[i].class);
        }
    }
    fclose(fin);
}


void write(STU st[],char *filename){
    int i;
    
    FILE *fp;
    fp = fopen(filename,"w");
    if(!fp){
        printf("fail to open file\n");
        return;
    }
    for(i=0;i<5;i++){
        fprintf(fp,"%d %s %s\n",st[i].id,st[i].name,st[i].class);
    }
    fclose(fp);
}


int main(){
    STU fomer[N];
    STU st[5];
    read(fomer);
    
    int x[5];
    int i,j;
    int randnum=0;
    srand(time(NULL));
    for(i=0;i<5;i++){
        
        randnum=rand()%80+1;
        x[i]=randnum;
    }
    for(i=0;i<5;i++){
        for(j=0;j<N;j++){
            if(fomer[j].id%100==x[i]){
                st[i]=fomer[j];
                continue;
            }
        }
    }
    for(j=0;j<5;j++){
        printf("%-10d %-10s %-10s\n",st[j].id,st[j].name,st[j].class);
    }
    printf("输入文本名:");
    char filename[100];
    scanf("%99s", filename);
    printf("保存成功");
    write(st,filename);
    return 0;
}

 

标签:int,st,STU,实验,printf,t%,fin
From: https://www.cnblogs.com/-suntao-/p/18638930

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