实验六

实验任务4

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main()
{
char a[2][100] = { "nuist2022-nuist2023","FIFA World Cup 2022" };
FILE* fp;
int i, n = 0;
char ch;
fp = fopen("data4.txt", "w");
if (fp == NULL)
{
printf("fail to open file\n");
return 1;
}
for (i = 0; i < 2; i++)
{
fputs(a[i], fp);
fputs("\n", fp);
}
fclose(fp);
fp = fopen("data4.txt", "r");
if (fp == NULL)
{
printf("fail to open file\n");
return 1;
}
while (!feof(fp))
{
ch = fgetc(fp);
if (ch != ' ' && ch != '\n' && ch != ' ')
n++;
}
n--;
printf("字母数%d\n", n);
system("pause");
return 0;
}

实验任务5

#define _CRT_SECURE_NO_WARNINGS
#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);
system("pause");
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);
}
// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n) {
int i, j;
STU temp;
for (i = 0; i < n; i++)
{
s[i].sum = s[i].objective + s[i].subjective;
}
for (i = 0; i < n - 1; i++)
for (j = 0; j < n - i - 1; j++)
if (s[j].sum < s[j + 1].sum)
{
temp = s[j];
s[j] = s[j + 1];
s[j + 1] = temp;
}

for (i = 0; i < n; i++)
{
if (i < n * 0.1)
strcpy(s[i].level, "优秀");
else if (i >= n * 0.1 && i < n * 0.5)
strcpy(s[i].level, "合格");
else
strcpy(s[i].level, "不合格");
}

}

实验任务6

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
typedef struct student
{
int number;
char name[20];
char Class[30];
}STU;
int main()
{
STU a[80];
int i, j;
FILE* fp;
fp = fopen("list.txt", "r");
if (fp == NULL)
{
printf("fail to open file\n");
return 1;
}
for (i = 0; i < 80; i++)
fscanf(fp, "%d %s%s", &a[i].number, a[i].name, a[i].Class);
fclose(fp);
fp = fopen("lucky.txt", "w");
for (i = 0; i < 5; i++)
{
j = rand() % 80;
printf("%d %s %s\n", a[j].number, a[j].name, a[j].Class);
fprintf(fp, "%d %s %s", a[j].number, a[j].name, a[j].Class);
fprintf(fp, "\n");
}
fclose(fp);
system("pause");
return 0;
}