实验七
task_4
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#include <stdio.h>
#define MAX 1000
int main(){
FILE *fp;
char line[MAX];
int lines = 0;
int chars = 0;
int i;
fp =fopen("data4.txt","r");
if(fp == NULL){
printf("无法打开文件 data4.txt\n");
return 1;
}
while (fgets(line, sizeof(line), fp) != NULL){
lines++;
for( i = 0; line[i] != '\0'; i++){
char c = line[i];
if (c != ' ' && c != '\n' && c != '\t') {
chars++;
}
}
}
fclose(fp);
printf("data4.txt统计结果: \n");
printf("行数：%d\n", lines);
printf("字符数（不及空白符）：%d\n", chars);
return 0;
}
task_5
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#include <stdio.h>
#include <string.h>
#define N 10
typedef struct {
long id;
char name[20];
float objective;
float subjective;
float sum;
char result[10];
} 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: 已完成\n", N);
read(stu, N);
printf("\n对考生成绩进行统计: 已完成\n");
cnt = process(stu,N,stu_pass);
printf("\n所有考生完整信息:\n");
output(stu,N);
printf("\n通过考试的名单写入文件: 已完成!\n");
write(stu_pass, cnt);
pass_rate = 1.0*cnt/N;
printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);
return 0;
}
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;
}
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);
}
// 对考生信息进行处理：计算每位考生考试总分、结果；统计并返回通过考试的人数
int process(STU st[], int n, STU st_pass[]){
int i;
int cnt = 0;
for(i = 0; i < n; i++)
st[i].sum = st[i].objective + st[i].subjective;
for(i = 0; i < n; i++)
if(st[i].sum >= 60){
strcpy(st[i].result, "通过");
st_pass[cnt] = st[i];
cnt++;
}else {
strcpy(st[i].result, "不通过");
}
return cnt;
}
// 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 st[], int n){
int i;
FILE *fp;
fp = fopen("list_pass.txt","w");
if(fp == NULL){
printf("无法创建 list_pass.txt\n");
return ;
}
for(i = 0; i < n; i++) {
fprintf(fp,"%ld %s %.2f %.2f %.2f %s\n",
st[i].id, st[i].name,
st[i].objective, st[i].subjective,
st[i].sum, st[i].result);
}
fclose(fp);
}
task_6
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define N 80
#define K 5
#define LEN 20
typedef struct {
long id;
char name[LEN];
char cls[30];
} stu;
void read(stu s[], int *n);
void pick(stu s[], int n, stu w[], int k);
void sort(stu w[], int k);
void output(stu w[], int k);
void save(stu w[], int k, const char *fname);
int main() {
char fname[100];
stu all[N], win[K];
int cnt = 0;
read(all, &cnt);
if (cnt == 0) {
printf("文件读取失败或无数据\n");
return 1;
}
printf("成功读取 %d 名学生\n", cnt);
srand((unsigned)time(NULL));
pick(all, cnt, win, K);
sort(win, K);
output(win, K);
printf("输入文件名：");
scanf("%s", fname);
save(win, K, fname);
return 0;
}
void read(stu s[], int *n) {
int i = 0;
FILE *fp = fopen("list.txt", "r");
if (!fp) {
*n = 0;
return;
}
while (fscanf(fp, "%ld %s %s", &s[i].id, s[i].name, s[i].cls) == 3 && i < N)
i++;
*n = i;
fclose(fp); // 建议加上关闭文件
}
void pick(stu s[], int n, stu w[], int k) {
int flag[N] = {0}, cnt = 0;
while (cnt < k) {
int idx = rand() % n;
if (!flag[idx]) {
flag[idx] = 1;
w[cnt++] = s[idx];
}
}
}
void sort(stu w[], int k) {
int i, j;
stu t;
for (i = 0; i < k - 1; i++)
for (j = 0; j < k - 1 - i; j++)
if (w[j].id > w[j + 1].id) {
t = w[j];
w[j] = w[j + 1];
w[j + 1] = t;
}
}
void output(stu w[], int k) {
int i;
printf("\n中奖名单（学号 姓名 班级）：\n");
for (i = 0; i < k; i++)
printf("%ld %s %s\n", w[i].id, w[i].name, w[i].cls);
printf("\n");
}
void save(stu w[], int k, const char *fname) {
int i;
FILE *fp = fopen(fname, "w");
if (!fp) {
printf("文件创建失败\n");
return;
}
for (i = 0; i < k; i++)
fprintf(fp, "%ld %s %s\n", w[i].id, w[i].name, w[i].cls);
fclose(fp);
}
选做
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define N 80
#define K 5
#define LEN 20
typedef struct {
long id;
char name[LEN];
char cls[30];
} stu;
void read(stu s[], int *n);
void pick(stu s[], int n, stu w[], int k);
void sort(stu w[], int k);
void output(stu w[], int k);
void save(stu w[], int k, const char *fname);
void FT(char *fname, int size);
int main() {
char fname[100];
stu all[N], win[K];
int cnt = 0;
read(all, &cnt);
if (cnt == 0){
printf("文件读取失败或无数据\n");
return 1;
}
printf("成功读取 %d 名学生\n", cnt);
srand((unsigned)time(NULL));
pick(all, cnt, win, K);
sort(win,K);
output(win, K);
FT(fname, sizeof(fname));
save(win,K,fname);
return 0;
}
void read(stu s[], int *n){
int i = 0;
FILE *fp = fopen("list.txt", "r");
if(!fp){
*n = 0;
return;
}
while(fscanf(fp, "%ld %s %s", &s[i].id, s[i].name, s[i].cls)== 3 && i < N)
i++;
*n = i;
fclose(fp);
return;
}
void pick(stu s[], int n, stu w[], int k) {
int flag[N] = {0}, cnt = 0;
while(cnt < k) {
int idx = rand() % n;
if(!flag[idx]) {
flag[idx] = 1;
w[cnt++] = s[idx];
}
}
}
void sort(stu w[], int k) {
int i,j;
stu t;
for(i = 0; i < k - 1; i++)
for(j = 0; j < k -1 - i;j++)
if (w[j].id > w[j + 1].id) {
t = w[j];
w[j] = w[j + 1];
w[j + 1] = t;
}
}
void output(stu w[], int k) {
int i;
printf("\n中奖名单：\n");
for ( i = 0; i < k; i++)
printf("%ld\t\t%s\t\t%s\n", w[i].id,w[i].name,w[i].cls);
printf("\n");
}
void save(stu w[], int k, const char *fname) {
int i;
FILE *fp = fopen(fname,"w");
if(!fp)
{printf("文件创建失败\n");
return;
}
for ( i = 0; i < k; i++)
fprintf(fp,"%ld\t\t%s\t\t%s\n", w[i].id,w[i].name,w[i].cls);
fclose(fp);
}
void FT(char *fname, int size){
time_t t = time(NULL);
struct tm *tm = localtime(&t);
strftime(fname,size,"%Y%m%d.txt",tm);
}
总结--借助ai生成的
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