实验6 文件应用编程

实验任务 4

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main()
{
    FILE* fp;
    char ch;
    int count=0;
    fp = fopen("E:\\study\\sourse\\data4.txt", "r");
    if (fp == NULL) {
        printf("cannot open the file\n");
        exit(0);
    }
    while (!feof(fp)) {
        ch = fgetc(fp);
        if (ch!=' '&&ch!='\n'&&ch!="\t"&&ch!=EOF) {
            count++;
        }
    }
    printf("%d", count);
    return 0;
}

实验任务 5

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 10
typedef struct {
long id;
char name[20];
float objective;
float subjective;
float sum;
char level[10];
}STU;
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;
}
void input(STU s[], int n) {
FILE* fp;
int i;
fp = fopen("E:\\study\\sourse\\examinee.txt", "r");
if (fp == NULL) {
printf("fail to open the file\n");
exit(0);
}
for (i = 0; i < n; i++) {
fscanf(fp,"%ld %s %f %f", &s[i].id,s[i].name, &s[i].objective,&s[i].subjective);
}
fclose(fp);
}
void output(STU s[], int n) {
FILE* fp;
int i;
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);
}
fp = fopen("E:\\study\\sourse\\a.txt", "w");
if (fp == NULL) {
printf("fail to open the file\n");
exit(0);
}
fprintf(fp,"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(fp,"%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(fp);
}
void process(STU s[], int n) {
int i,j;
STU t;
double flag1,flag2;
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) {
t = s[j];
s[j] = s[j + 1];
s[j + 1] = t;
}
}
}
flag1 =(0.1 * n);
flag2 = (0.5 * n);
for (i = 0; i <= flag1-1; i++) {
strcpy(s[i].level, "优秀");
}
for (i = flag1 ; i <= flag2-1; i++) {
strcpy(s[i].level, "合格");
}
for (i = flag2; i < n; i++) {
strcpy(s[i].level, "不合格");
}
}

实验任务6

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define N 80
#define M 5
typedef struct {
    long id;
    char name[20];
    char class[50];
}STU;
void input(STU s[], int n);
void output(STU s[],STU lucky[], int n);
void process(STU s[],STU lucky[], int n);
int main()
{
    STU s[N], lucky[5];
    input(s, N);
    process(s, lucky, M);
    output(s, lucky, M);
    return 0;
}
void input(STU s[], int n) {
    FILE* fp;
    int i;
    fp = fopen("E:\\study\\sourse\\list.txt", "r");
    if (fp == NULL) {
        printf("fail to open the file\n");
        exit(0);
    }
    for (i = 0; i < n; i++) {
        fscanf(fp,"%ld %s %s",&s[i].id,s[i].name,s[i].class);
    }
    fclose(fp);
}
void output(STU s[],STU lucky[], int n) {
    FILE* fp;
    int i;
    printf("lucky people are:\n");
    for (i = 0; i < n; i++) {
        printf("%ld\t%s\t%s\n", s[i].id,
            lucky[i].name, lucky[i].class);
    }
        fp = fopen("E:\\study\\sourse\\a.txt", "w");
        if (fp == NULL) {
            printf("fail to open the file\n");
            exit(0);
        }
    }
    for (i = 0; i < n; i++) {
        fprintf(fp, "%ld\t\t%s\t%s\n", s[i].id,
            lucky[i].name, lucky[i] .class);
    }
    fclose(fp);
}
void process(STU s[],STU lucky[], int n) {
    srand(time(0));
    int x[5],i,j;
    int t;
    int flag = 0;
    for(i=0;i<5;i++){
        x[i] = rand()%81;
    }
    for (i = 0; i < 5; i++) {
        for (j = i+1; j < 5; j++) {
            if (x[i] == x[j]) {
                x[i] = rand() % 80;
                i=0;
                break;
            }
        }
    }
    for (i = 0; i < 5; i++) {
        t = x[i];
        lucky[i] = s[t];
    }
}