实验7
task4
- 源代码
View Code1 #define _CRT_SECURE_NO_WARNINGS 2 #include <stdio.h> 3 int main() 4 { 5 FILE *fp; 6 char ch; 7 int line = 0; 8 int cnt = 0; 9 int newline=1; 10 fp = fopen("data4.txt", "r"); 11 if (fp == NULL) { 12 printf("打开失败\n"); 13 return 1; 14 } 15 while ((ch = fgetc(fp)) != EOF) { 16 if (newline){ 17 line++; 18 newline = 0; 19 } 20 if (ch == '\n') 21 newline=1; 22 if (ch != ' ' && ch != '\t' && ch != '\n') 23 cnt++; 24 } 25 fclose(fp); 26 printf("data4.txt统计结果:\n"); 27 printf("行数:\t\t\t%d\n",line); 28 printf("字符数(不计空白符):\t%d\n",cnt); 29 return 0; 30 }
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task5
- 源代码
View Code1 #define _CRT_SECURE_NO_WARNINGS 2 #include <stdio.h> 3 #include <string.h> 4 5 #define N 10 6 7 typedef struct { 8 long id; // 准考证号 9 char name[20]; // 姓名 10 float objective; // 客观题得分 11 float subjective; // 操作题得分 12 float sum; // 总分 13 char result[10]; // 考试结果 14 } STU; 15 16 // 函数声明 17 void read(STU st[], int n); 18 void write(STU st[], int n); 19 void output(STU st[], int n); 20 int process(STU st[], int n, STU st_pass[]); 21 22 int main() { 23 STU stu[N], stu_pass[N]; 24 int cnt; 25 double pass_rate; 26 27 printf("从文件读入%d个考生信息: 已完成\n", N); 28 read(stu, N); 29 30 printf("\n对考生成绩进行统计: 已完成\n"); 31 cnt = process(stu, N, stu_pass); 32 33 printf("\n所有考生完整信息:\n"); 34 output(stu, N); 35 36 printf("\n通过考试的名单写入文件: 已完成!\n"); 37 write(stu_pass, cnt); 38 39 pass_rate = 1.0 * cnt / N; 40 printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); 41 42 return 0; 43 } 44 45 // 把所有考生完整信息输出到屏幕上 46 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 47 void output(STU st[], int n) { 48 int i; 49 50 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"); 51 for (i = 0; i < n; i++) 52 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); 53 } 54 55 // 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 56 void read(STU st[], int n) { 57 int i; 58 FILE *fin; 59 60 fin = fopen("examinee.txt", "r"); 61 if (!fin) { 62 printf("fail to open file\n"); 63 return; 64 } 65 66 for (i = 0; i < n; i++) 67 fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective); 68 69 fclose(fin); 70 } 71 72 // 对考生信息进行处理:计算每位考生考试总分、结果;统计并返回通过考试的人数 73 int process(STU st[], int n, STU st_pass[]) { 74 int i; 75 int k = 0; 76 for (i = 0; i < n; i++) { 77 st[i].sum = st[i].objective + st[i].subjective; 78 if (st[i].sum >= 60) { 79 strcpy(st[i].result, "通过"); 80 st_pass[k] = st[i]; 81 k++; 82 } 83 else 84 strcpy(st[i].result, "不通过"); 85 } 86 return k; 87 } 88 89 // 把通过考试的考生完整信息写入文件list_pass.txt 90 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 91 void write(STU st[], int n) { 92 int i; 93 FILE *fout; 94 fout = fopen("list_pass.txt", "w"); 95 if (!fout) { 96 printf("写入文件失败\n"); 97 return; 98 } 99 fprintf(fout, "准考证号\t姓名\t客观题得分\t操作题得分\t总分\t结果\n"); 100 for (i = 0; i < n; i++) { 101 fprintf(fout,"%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); 102 } 103 fclose(fout); 104 }
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task6
- 源代码
View Code1 #define _CRT_SECURE_NO_WARNINGS 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <time.h> 5 #include <string.h> 6 #define M 80 7 #define N 5 8 9 typedef struct { 10 char id[15]; 11 char name[15]; 12 char cls[30]; 13 } Student; 14 15 int main(void) 16 { 17 FILE* fp; 18 Student stu[M], win[N]; 19 int flag[M] = { 0 }; 20 int total = 0, i, j, randIdx; 21 char fileName[30]; 22 23 fp = fopen("list.txt", "r"); 24 if (!fp) 25 { 26 printf("打开list.txt失败!\n"); 27 return 1; 28 } 29 while (fscanf(fp, "%s %s %s", stu[total].id, stu[total].name, stu[total].cls) == 3) 30 { 31 total++; 32 } 33 fclose(fp); 34 35 srand((unsigned)time(NULL)); 36 for (i = 0; i < N; ) 37 { 38 randIdx = rand() % total; 39 if (flag[randIdx] == 0) 40 { 41 flag[randIdx] = 1; 42 win[i] = stu[randIdx]; 43 i++; 44 } 45 } 46 47 printf("------------------中奖名单------------------\n", fileName); 48 for (i = 0; i < N; i++) 49 { 50 printf("%s\t%s\t%s\n", win[i].id, win[i].name, win[i].cls); 51 } 52 53 printf("输入文件名:"); 54 scanf("%s", fileName); 55 56 fp = fopen(fileName, "w"); 57 if (!fp) 58 { 59 printf("文件创建失败!\n"); 60 return 1; 61 } 62 for (i = 0; i < N; i++) 63 { 64 fprintf(fp, "%s\t%s\t%s\n", win[i].id, win[i].name, win[i].cls); 65 } 66 fclose(fp); 67 printf("----------------保存到文件----------------\n"); 68 printf("文件保存成功!\n"); 69 70 return 0; 71 }
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