实验任务6

#include <stdio.h>
#include <stdlib.h>
int main()
{
char cr;
FILE *fp;
long count;
if((fp=fopen("data4.txt","r"))==NULL)
{
printf("Can't open file.\n");
system("pause");
exit(1);
}
count = 0;
while((cr=fgetc(fp))!=EOF)
{
if(cr!=' '&&cr!='\n'&&cr!='\t')
count++;
}
fclose(fp);
printf("date4.txt中共有 %ld 个字符。\n",count);
system("pause");
return 0;
}

#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) {
// 补足代码
// ×××
int i,k;
STU t;
for(i=0;i<n;i++){
s[i].sum=s[i].objective+s[i].subjective;
}
for(i=0;i<n-1;i++){
for(int j=0;j<n-1;j++){
if(s[j+1].sum>s[j].sum){
t=s[j+1];
s[j+1]=s[j];
s[j]=t;}
}
}
for(k=0;k<n;k++){
if(k<=n*0.1-1)
strcpy(s[k].level,"优秀");
else if(k>=n*0.1-1&&k<=n*0.5-1)
strcpy(s[k].level,"合格");
else
strcpy(s[k].level,"不合格");

}
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

typedef struct
{
long int no;
char name[20];
char cla[100];
}stu;

int main()
{
FILE *fp1;
fp1 = fopen("list.txt","r");

stu a[80];
int i = 0;
while(!feof(fp1))
{
fscanf(fp1,"%ld %s %s",&a[i].no,a[i].name,a[i].cla);
i++;
}
fclose(fp1);

time_t T;
T = time(NULL);
struct tm *tmTime;
tmTime = localtime(&T);
char* format = "%Y%m%d";
char strTime[100];
strftime(strTime, sizeof(strTime), format, tmTime);
strcat(strTime,".txt");

FILE *fp2;
fp2 = fopen(strTime,"w");
srand((unsigned int)time(0));
int count,b[5],repeat = 0;
for(int i = 0;i < 5;i++)
{
count = rand() % 80;

for(int k = 0;k < i;k++)
if(b[k] == count) repeat = 1;
if(repeat)
{
i--;
repeat = 0;
continue;
}

b[i] = count;
fprintf(fp2,"%ld %s %s\n",a[count].no,a[count].name,a[count].cla);
printf("%ld %s %s\n",a[count].no,a[count].name,a[count].cla);

}
fclose(fp2);

return 0;
}