实验七
task4:
1 #include<stdio.h> 2 int main() 3 { 4 char a; 5 int count=0; 6 FILE *fp; 7 fp = fopen("data4.txt","r"); 8 if(fp==NULL) { 9 printf("fail to open\n"); 10 return 1; 11 } 12 while(1) 13 { 14 a=fgetc(fp); 15 if(a==EOF) 16 break; 17 if(a==' '||a=='\n'||a=='\t') 18 count--; 19 count++; 20 21 } 22 printf("data4.txt中共包含字符数(不计空白符):%d",count); 23 fclose(fp); 24 return 0; 25 }
task5:
1 #include <stdio.h> 2 #include <string.h> 3 #include <stdlib.h> 4 5 #define N 10 6 7 typedef struct { 8 long int id; 9 char name[20]; 10 float objective; // 客观题得分 11 float subjective; // 操作题得分 12 float sum; // 总分 13 char ans[10]; // 考试结果 14 } STU; 15 16 // 函数声明 17 void finput(STU st[], int n); 18 void foutput(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...\n", N); 28 finput(stu, N); 29 30 printf("\n对考生成绩进行统计...\n"); 31 cnt = process(stu, N, stu_pass); 32 33 printf("\n通过考试的名单:\n"); 34 output(stu, N); // 输出到屏幕 35 foutput(stu, N); // 输出到文件 36 37 pass_rate = 1.0 * cnt / N; 38 printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); 39 40 return 0; 41 } 42 43 // 把通过考试的考生完整信息输出到屏幕上 44 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 45 void output(STU st[], int n) { 46 int i; 47 48 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"); 49 for (i = 0; i < n; i++) 50 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); 51 } 52 53 // 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 54 void finput(STU st[], int n) { 55 int i; 56 FILE *fin; 57 58 fin = fopen("examinee.txt", "r"); 59 if (fin == NULL) { 60 printf("fail to open file\n"); 61 exit(0); 62 } 63 64 while (!feof(fin)) { 65 for (i = 0; i < n; i++) 66 fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective); 67 } 68 69 fclose(fin); 70 } 71 72 // 把通过考试的考生完整信息写入文件list_pass.txt 73 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 74 void foutput(STU s[], int n) { 75 FILE *fout; 76 int i; 77 78 // 保存到文件 79 fout = fopen("list_pass.txt", "w"); 80 if (!fout) { 81 printf("fail to open or create list_pass.txt\n"); 82 exit(0); 83 } 84 85 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"); 86 87 for (i = 0; i < n; i++) 88 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); 89 90 fclose(fout); 91 } 92 93 94 95 // 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 96 int process(STU st[], int n, STU st_pass[]) { 97 int i,j=0,count=0; 98 for(i=0;i<n;i++) 99 { 100 st[i].sum=st[i].objective+st[i].subjective; 101 if(st[i].sum<60) 102 strcpy(st[i].ans,"fail"); 103 else 104 {strcpy(st[i].ans,"pass"); 105 count++; 106 st_pass[j++]=st[i];} 107 108 109 } 110 return count; 111 }
task6:
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<time.h> 4 5 typedef struct{ 6 long id; 7 char name[20]; 8 char ban[40]; 9 }xx; 10 int main() 11 { 12 xx a[5],x[80]; 13 int i,n; 14 FILE *fp,*fps; 15 fp = fopen("list.txt","r"); 16 if(fp==NULL) { 17 printf("fail to open\n"); 18 return 1; 19 } 20 srand((double)time(NULL)); 21 for(i=0;i<80;i++) 22 fscanf(fp,"%ld%s%s",&x[i].id,x[i].name,x[i].ban); 23 for(i=0;i<5;i++) 24 { 25 n=rand()%(204942080-204942001+1); 26 a[i]=x[n]; 27 printf("%-20ld%-20s%-20s\n",a[i].id,a[i].name,a[i].ban); 28 } 29 fclose(fp); 30 fps=fopen ("lucky.txt","w"); 31 if(fps==NULL) 32 { 33 printf("fail to open\n"); 34 return 1; 35 } 36 for(i=0;i<5;i++) 37 fprintf(fps,"%-20ld%-20s%-20s\n",a[i].id,a[i].name,a[i].ban); 38 fclose(fps); 39 return 0; 40 }