实验七
实验4
1 #include<stdio.h> 2 #include<string.h> 3 #define N 100 4 5 int main() { 6 int i = 0, j = 0, s = 0,k; 7 char words[N]; 8 FILE* fp; 9 10 fp = fopen("data4.txt", "r"); 11 if (fp == NULL) { 12 return -1; 13 } 14 while(fgets(words,N,fp) != NULL){ 15 i++; 16 for(k = 0;k < strlen(words);k++) 17 if(words[k]!=' '&& words[k]!='\n') 18 j++; 19 } 20 21 22 fclose(fp); 23 24 printf("data4.txt统计结果:\n"); 25 printf("行数:%d\n",i); 26 printf("字符数(不计空白符):%d",j); 27 28 return 0; 29 }

实验5
1 #include <stdio.h> 2 #include <string.h> 3 4 #define N 10 5 6 typedef struct { 7 long id; // 准考证号 8 char name[20]; // 姓名 9 float objective; // 客观题得分 10 float subjective; // 操作题得分 11 float sum; // 总分 12 char result[10]; // 考试结果 13 } STU; 14 15 // 函数声明 16 void read(STU st[], int n); 17 void write(STU st[], int n); 18 void output(STU st[], int n); 19 int process(STU st[], int n, STU st_pass[]); 20 21 int main() { 22 STU stu[N], stu_pass[N]; 23 int cnt; 24 double pass_rate; 25 26 printf("从文件读入%d个考生信息...\n", N); 27 read(stu, N); 28 29 printf("\n对考生成绩进行统计...\n"); 30 cnt = process(stu, N, stu_pass); 31 32 printf("\n通过考试的名单:\n"); 33 output(stu, N); // 输出所有考生完整信息到屏幕 34 write(stu, N); // 输出考试通过的考生信息到文件 35 36 pass_rate = 1.0 * cnt / N; 37 printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); 38 39 return 0; 40 } 41 42 // 把所有考生完整信息输出到屏幕上 43 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 44 void output(STU st[], int n) { 45 int i; 46 47 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"); 48 for (i = 0; i < n; i++) 49 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); 50 } 51 52 // 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 53 void read(STU st[], int n) { 54 int i; 55 FILE *fin; 56 57 fin = fopen("examinee.txt", "r"); 58 if (!fin) { 59 printf("fail to open file\n"); 60 return; 61 } 62 63 while (!feof(fin)) { 64 for (i = 0; i < n; i++) 65 fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective); 66 } 67 68 fclose(fin); 69 } 70 71 // 把通过考试的考生完整信息写入文件list_pass.txt 72 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 73 void write(STU s[], int n) { 74 int i; 75 FILE *fin; 76 77 fin = fopen("list_pass.txt", "w"); 78 if (!fin) { 79 printf("fail to open file\n"); 80 return; 81 } 82 fprintf(fin,"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"); 83 for(i = 0;i<n;i++){ 84 if(s[i].sum>=60) 85 fprintf(fin,"%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].result); 86 } 87 88 fclose(fin); 89 } 90 // 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 91 int process(STU st[], int n, STU st_pass[]){ 92 int k = 0,i; 93 for(i = 0;i<n;i++){ 94 st[i].sum = st[i].objective + st[i].subjective; 95 if(st[i].sum>=60){ 96 strcpy(st[i].result,"通过"); 97 st_pass[k++] = st[i]; 98 99 } 100 else 101 strcpy(st[i].result,"不通过"); 102 } 103 104 return k; 105 }

实验7
1 #include<stdio.h> 2 #include<stdlib.h> 3 #define N 80 4 typedef struct { 5 int xuhao[20]; 6 char id[30]; 7 char banji[20]; 8 }STU; 9 void read(STU st[], int n); 10 void select(STU st[], int n); 11 void write(STU s[], int n); 12 int main(){ 13 STU stu[N]; 14 15 return 0; 16 } 17 void read(STU st[], int n) { 18 int i; 19 FILE *fin; 20 21 fin = fopen("list.txt", "r"); 22 if (!fin) { 23 printf("fail to open file\n"); 24 return; 25 } 26 27 while (!feof(fin)) { 28 for (i = 0; i < n; i++) 29 fscanf(fin, "%ld %s %f %f", &st[i].xuhao, st[i].id, &st[i].banji); 30 } 31 32 fclose(fin); 33 } 34 void select(STU st[], int n){ 35 srand((unsigned int)time(NULL)); 36 int selected[5]; 37 int i; 38 39 for(i = 0; i < 5; i++) { 40 int index; 41 do { 42 index = rand() % N; 43 } while (index == selected[0] || index == selected[1] || index == selected[2] || index == selected[3] || index == selected[4]); 44 selected[i] = index; 45 } 46 47 printf("随机随机点名名单\n"); 48 for (i = 0; i < 5; i++) { 49 printf("%d %s %s\n", st[selected[i]].xuhao, st[selected[i]].id, st[selected[i]].banji); 50 } 51 } 52 void write(STU s[], int n) { 53 char name[N]; 54 printf("--------保存到文件--------\n"); 55 printf("输入文件名: "); 56 scanf("%s",&name); 57 58 int i; 59 FILE *fin; 60 61 fin = fopen(name, "w"); 62 if (!fin) { 63 printf("fail to open file\n"); 64 return; 65 } 66 67 for(i = 0;i<n;i++){ 68 fprintf(fin,"%ld\t\t%s\t%s\t\t\n", s[i].xuhao, s[i].id, s[i].banji); 69 } 70 71 fclose(fin); 72 }


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