实验七
task4
#include <stdio.h>
#include <string.h>
#define N 5
#define M 80
int main() {
char songs[N][M];
FILE* fp;
fp = fopen("data1.txt", "r");
if (fp == NULL) {
printf("fail to open file\n");
return 1;
}
int t = 0;
char h;
while (1) {
h = fgetc(fp);
if (h == EOF) {
break;
}
else if (h == ' ' || h == '\n') {
continue;
}
else {
t++;
}
}
printf("文件内字符数为%d\n", t);
fclose(fp);
return 0;
}

task5
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define N 10
typedef struct {
long int id;
char name[20];
float objective; // 客观题得分
float subjective; // 操作题得分
float sum; // 总分
char ans[10]; // 考试结果
} STU;
// 函数声明
void finput(STU st[], int n);
void foutput(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);
finput(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); // 输出到屏幕
foutput(stu, N); // 输出到文件
pass_rate = 1.0 * cnt / N;
printf("\n本次等级考试通过率: %.2f%%\n", pass_rate * 100);
return 0;
}
// 把通过考试的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].ans);
}
// 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 finput(STU st[], int n) {
int i;
FILE* fin;
fin = fopen("examinee.txt", "r");
if (fin == NULL) {
printf("fail to open file\n");
exit(0);
}
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 foutput(STU s[], int n) {
FILE* fout;
int i;
// 保存到文件
fout = fopen("list_pass.txt", "w");
if (!fout) {
printf("fail to open or create list_pass.txt\n");
exit(0);
}
fprintf(fout, "准考证号\t\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++)
fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].ans);
fclose(fout);
}
// 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[]) {
FILE* fscore;
int cnt = 0;
fscore = fopen("list_pass.txt", "r");
for (int i = 0; i < n; i++) {
st[i].sum = st[i].objective + st[i].subjective;
}
for (int i = 0; i < n; i++) {
if (st[i].sum >= 60) {
strcpy(st[i].ans, "pass");
cnt++;
}
else {
strcpy(st[i].ans, "fail");
}
}
return cnt;
}

task6
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 80
typedef struct {
int id;
char name[20];
char class[100];
}info;
void finput(info stu[], int n) {
FILE* fp;
fp = fopen("list.txt", "r");
while (!feof(fp)) {
for (int i = 0; i < N; i++) {
fscanf(fp, "%d%s%s", &stu[i].id, stu[i].name, stu[i].class);
}
}
fclose(fp);
}
void output(info stu[], int n) {
for (int i = 0; i < n; i++)
printf("%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class);
}
void translate(info stu[], info sts[], int n) {
srand((unsigned)time(NULL));
int judge[80] = { 0 };
for (int i = 0; i < 5; i++) {
int j = rand() % 80 + 1;
if (judge[j] == 1) {
i--;
continue;
}
sts[i].id = stu[j].id;
strcpy(sts[i].name, stu[j].name);
strcpy(sts[i].class, stu[j].class);
judge[j] = 1;
}
}
void sort(info sts[], int n) {
for (int i = 0; i < 5; i++) {
for (int j = i; j < 5; j++) {
if (sts[i].id > sts[j].id) {
int l = sts[i].id;
sts[i].id = sts[j].id;
sts[j].id = l;
char p[100];
strcpy(p, sts[i].name);
strcpy(sts[i].name, sts[j].name);
strcpy(sts[j].name, p);
}
}
}
}
int main()
{
info stu[N], sts[5];
finput(stu, N);
output(stu, N);
printf("\n");
translate(stu, sts, N);
sort(sts, 5);
output(sts, 5);
return 0;
}


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