实验七
实验任务4
实验代码
#include <stdio.h>
int main() {
FILE *file;
char filename[100];
char ch;
int count = 0;
file = fopen("data4.txt", "r");
if (file == NULL) {
printf("无法打开文件\n");
return 1;
}
while ((ch = fgetc(file)) != EOF) {
if (ch != ' ' && ch != '\n' && ch != '\t') {
count++;
}
}
fclose(file);
printf("data4.txt中共包含字符数(不包括空白符):%d\n", count);
return 0;
}
实验结论
实验任务5
实验代码
#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;
char level[10];
} STU;
// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);
int main() {
STU stu[N];
printf("从文件读入%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, 并保存到文件中");
output(stu, N);
return 0;
}
// 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 input(STU s[], 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", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective);
}
fclose(fin);
}
// 输出考生完整信息: 准考证号,姓名,客观题得分,操作题得分,总分,等级
// 不仅输出到屏幕上,还写到文本文件result.txt中
void output(STU s[], int n) {
FILE *fout;
int i;
// 输出到屏幕
printf("\n");
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等级\n");
for (i = 0; i < n; i++)
printf("%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].level);
// 保存到文件
fout = fopen("result.txt", "w");
if (!fout) {
printf("fail to open or create result.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等级\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].level);
fclose(fout);
}
void process(STU s[], int n) {
int i, j;
STU temp;
float sum;
float passLine10, passLine50;
for (i = 0; i < n; i++) {
sum = s[i].objective + s[i].subjective;
s[i].sum = sum;
}
for (i = 0; i < n - 1; i++) {
for (j = 0; j < n - 1 - i; j++) {
if (s[j].sum < s[j + 1].sum) {
temp = s[j];
s[j] = s[j + 1];
s[j + 1] = temp;
}
}
}
passLine10 = s[n / 10].sum;
passLine50 = s[n / 2].sum;
for (i = 0; i < n; i++) {
if (s[i].sum > passLine10) {
strcpy(s[i].level, "优秀");
} else if (s[i].sum > passLine50) {
strcpy(s[i].level, "合格");
} else {
strcpy(s[i].level, "不合格");
}
}
}
实验结论
实验任务6
实验代码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define N 80
#define M 5
typedef struct {
int id;
char name[50];
char className[50];
} Student;
int main() {
Student students[N];
Student luckyStudents[M];
int numStudents = 0;
FILE *file = fopen("list.txt", "r");
if (file == NULL) {
printf("无法打开文件\n");
return 1;
}
while (fscanf(file, "%d %s %[^\n]", &students[numStudents].id, students[numStudents].name, students[numStudents].className) != EOF) {
numStudents++;
}
fclose(file);
srand(time(NULL));
int i, j;
int index;
int selected[N] = {0};
for (i = 0; i < M; i++) {
index = rand() % numStudents;
while (selected[index] == 1) {
index = rand() % numStudents;
}
selected[index] = 1;
luckyStudents[i] = students[index];
}
printf("随机抽取的幸运学生信息:\n");
printf("学号\t姓名\t\t班级\n");
for (i = 0; i < M; i++) {
printf("%d\t%s\t\t%s\n", luckyStudents[i].id, luckyStudents[i].name, luckyStudents[i].className);
}
FILE *outputFile = fopen("lucky.txt", "w");
if (outputFile == NULL) {
printf("无法创建文件\n");
return 1;
}
fprintf(outputFile, "学号\t姓名\t\t班级\n");
for (i = 0; i < M; i++) {
fprintf(outputFile, "%d\t%s\t\t%s\n", luckyStudents[i].id, luckyStudents[i].name, luckyStudents[i].className);
}
fclose(outputFile);
return 0;
}
实验结论