实验七

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int main()
{
FILE* fp;
fp = fopen("data4.txt", "r");
if (fp == NULL)
{
printf("fail to open\n");
return 1;
}
char ch;
int i;
ch = fgetc(fp);
for (i = 0;ch!=EOF;)
{
if ((ch != ' ') && (ch != '\n') && (ch != '\t'))
i++;
ch = fgetc(fp);

}
printf("data4.txt中共包含字符数（不计空白符）：%d", i);
fclose(fp);
return 0;
}

 

task5

#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);

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, k, m;
double id, objective, subjective, sum;
char x[20];
for (i=0;i<n;i++)
{
s[i].sum = s[i].objective + s[i].subjective;
}
for (k = 0;k<n; k++)
{
for (j = 0;j<n; j++)
{
if (s[j].sum < s[j + 1].sum)
{
sum = s[j].sum;
id = s[j].id;
objective = s[j].objective;
subjective = s[j].subjective;
strcpy(x, s[j].name);

s[j].sum=s[j+1].sum;
s[j].id=s[j+1].id;
s[j].objective=s[j+1].objective;
s[j].subjective=s[j+1].subjective;
strcpy(s[j].name, s[j + 1].name);

s[j+1].sum = sum;
s[j+1].id = id;
s[j+1].objective = objective;
s[j+1].subjective = subjective;
strcpy(s[j+1].name,x);
}
}
}
strcpy(s[0].level, "优秀");
for (m = 0; m < n; m++)
{
if (((m + 1) <= (i / 2)) && (m + 1) > (i / 10))
{
strcpy(s[m].level, "合格");
}
if ((m + 1) > (i / 2))
{
strcpy(s[m].level, "不合格");
}
}
}

 

 

task6

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

typedef struct {
long int id;
char name[20];
char class[100];
}STU;
STU s[N];

int main()
{
int m, n;
FILE* lwh;
int i;
lwh = fopen("list.txt", "r");
if (lwh == NULL)
{
printf("fail to open file\n");
exit(0);
}
while (!feof(lwh))
{
for (i = 0; i < N; i++)
fscanf(lwh, "%ld %s %s", &s[i].id, s[i].name, s[i].class);
}
FILE* cyf;
cyf = fopen("lucky.txt", "w+");
if (!cyf) {
printf("fail to open or create lucky.txt\n");
exit(0);
}
srand(time(0));
for (n = 1; n <= 5; n++)
{
m = rand()%80+1;
printf("%ld\t %s\t %s\n", s[m].id, s[m].name, s[m].class);
fprintf(cyf, "%ld\t %s\t %s\n", s[m].id, s[m].name, s[m].class);
}
fclose(lwh);
fclose(cyf);
return 0;
}