实验7

task4

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#include<stdio.h>int main(){FILE *fp;int sum=0;char ch;fp=fopen("data4.txt","r");if(fp==NULL){printf("不能打开文件\n");return 1;}ch=fgetc(fp);while((ch=fgetc(fp))!=EOF){if(ch!=' '&&ch!='\t'){++sum;}}fclose(fp);printf("文件中字符数为:%d",sum);return 0; 
} 

task5

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>#define N 10typedef struct {long int id;char name[20];float objective;    // 客观题得分float subjective;   // 操作题得分float sum;          // 总分char ans[10];       // 考试结果
} STU;// 函数声明
void finput(STU st[], int n);
void foutput(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);int main() {STU stu[N], stu_pass[N];int cnt;double pass_rate;printf("从文件读入%d个考生信息...\n", N);finput(stu, N);printf("\n对考生成绩进行统计...\n");cnt = process(stu, N, stu_pass);printf("\n通过考试的名单:\n");output(stu_pass, cnt);      // 输出到屏幕foutput(stu_pass, cnt);    // 输出到文件pass_rate = 1.0 * cnt / N;printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);return 0;
}// 把通过考试的考生完整信息输出到屏幕上
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void output(STU st[], int n) {int i;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结果\n");for (i = 0; i < n; i++)printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].ans);
}// 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 finput(STU st[], 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", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);}fclose(fin);
}// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void foutput(STU s[], int n) {FILE *fout;int i;// 保存到文件 fout = fopen("list_pass.txt", "w");if (!fout) {printf("fail to open or create list_pass.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结果\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].ans);fclose(fout);
}// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {int i,j=0;for (i = 0; i < n; i++) {st[i].sum = st[i].objective + st[i].subjective;if (st[i].sum > 60) {strcpy(st[i].ans, "pass");st_pass[j] = st[i];j++;}elsestrcpy(st[i].ans, "fail");
}return j;
}

task6

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#include<stdio.h>
#include<stdlib.h>
#include <time.h>
#define N 50typedef struct {
long int id;
char name[N];
char cl[N];
} STU;STU lucky[N],st[N];
void finput();
void foutput();
int main() {int m, n;finput();srand(time(NULL));for (m = 0; m < 5; m++) {n = rand() % 80;lucky[m] = st[n];printf("%ld\t %s\t %s\t\n", lucky[m].id, lucky[m].name, lucky[m].cl);}foutput();getchar();system("pause");return 0;
}void finput() {int i;FILE *fin;fin = fopen("list.txt", "r");if (fin == NULL) {printf("fail to open file\n");return;}while (!feof(fin)) {for (i = 0; i < 80; i++)fscanf(fin, "%ld %s %s", &st[i].id, st[i].name,&st[i].cl);}fclose(fin);
}void foutput() {FILE *fout;int i,n=5;fout = fopen("lucky.txt", "w");if (!fout) {printf("fail to open or create lucky.txt\n");return;
}for (i = 0; i < n; i++)fprintf(fout, "%ld\t\t%s\t\t\t%s\n", lucky[i].id,lucky[i].name,lucky[i].cl);fclose(fout);
}