实验七
task.4

1 #include <stdio.h> 2 #include <ctype.h> 3 #include <stdlib.h> 4 5 int main() { 6 FILE *file; 7 char filename[] = "data4.txt"; 8 int line_count = 0; 9 int char_count = 0; 10 int ch; 11 int in_line = 0; 12 13 file = fopen(filename, "r"); 14 if (file == NULL) { 15 printf("无法打开文件 %s\n", filename); 16 system("pause"); 17 return 1; 18 } 19 20 while ((ch = fgetc(file)) != EOF) { 21 if (ch == '\n') { 22 line_count++; 23 in_line = 0; 24 } else if (!isspace(ch)) { 25 char_count++; 26 in_line = 1; 27 } 28 29 } 30 31 32 if (in_line) { 33 line_count++; 34 } 35 36 fclose(file); 37 38 printf("%s统计结果:\n", filename); 39 printf("行数: %d\n", line_count); 40 printf("字符数(不计空白符): %d\n", char_count); 41 42 43 return 0; 44 }
task.5

#include <stdio.h> #include <string.h> #include<stdlib.h> #define N 10 typedef struct { long id; // 准考证号 char name[20]; // 姓名 float objective; // 客观题得分 float subjective; // 操作题得分 float sum; // 总分 char result[10]; // 考试结果 } STU; // 函数声明 void read(STU st[], int n); void write(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); read(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, N); // 输出所有考生完整信息到屏幕 write(stu, N); // 输出考试通过的考生信息到文件 pass_rate = 1.0 * cnt / N; printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); system("pause"); return 0; } // 把所有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].result); } // 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 read(STU st[], int n) { int i; FILE *fin; fin = fopen("d:\\examinee.txt", "r"); if (!fin) { printf("fail to open file\n"); return; } 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 write(STU st[], int n) { int i; char str[]="通过"; FILE *fin; fin = fopen("list_pass.txt", "w"); if (!fin) { printf("fail to open fileto write\n"); return; } fprintf(fin,"准考证号\t姓名\t\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++) if(!strcmp(st[i].result,str)) fprintf(fin,"%ld\t%s\t%.2f\t\t%.2f\t\t%.2f\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result); fclose(fin); } // 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,count=0; char str1[]="通过",str2[]="未通过"; for(i=0;i<n;i++){ st[i].sum=st[i].objective+st[i].subjective; if(st[i].sum>=60){ strcpy(st[i].result,str1); count+=1; } else strcpy(st[i].result,str2); } return count; }

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #define MAX_STUDENTS 100 #define NAME_LENGTH 50 #define WINNERS 5 int main() { FILE *fp; char students[MAX_STUDENTS][NAME_LENGTH]; char winners[WINNERS][NAME_LENGTH]; int count = 0; int selected[WINNERS] = {0}; char filename[100]; int i, j, random_num; fp = fopen("list.txt", "r"); if (fp == NULL) { printf("无法打开文件!\n"); return 1; } while (fgets(students[count], NAME_LENGTH, fp) != NULL && count < MAX_STUDENTS) { students[count][strcspn(students[count], "\n")] = 0; count++; } fclose(fp); if (count == 0) { printf("没有学生名单!\n"); return 1; } srand(time(NULL)); for (i = 0; i < WINNERS && count > 0; i++) { do { random_num = rand() % count; for (j = 0; j < i; j++) { if (selected[j] == random_num) { random_num = -1; break; } } } while (random_num == -1); selected[i] = random_num; strcpy(winners[i], students[random_num]); } printf("中奖名单:\n"); for (i = 0; i < WINNERS && i < count; i++) { printf("%s\n", winners[i]); } printf("请输入要写入的文件名:"); scanf("%s", filename); fp = fopen(filename, "w"); if (fp == NULL) { printf("无法创建文件!\n"); return 1; } for (i = 0; i < WINNERS && i < count; i++) { fprintf(fp, "%s\n", winners[i]); } fclose(fp); printf("中奖名单已写入 %s\n", filename); return 0; }