task4
1 #include<stdio.h> 2 int main() 3 { 4 int i,count=0; 5 int c; 6 FILE *fp; 7 fp=fopen("C://Users//Dell//Desktop//data4.txt","r"); 8 if(fp==NULL) 9 { 10 printf("fail to open file\n"); 11 return 1; 12 } 13 while(!feof(fp)) 14 { 15 c=fgetc(fp); 16 count++; 17 if(c==10||c==32||c==9||c==0||c==13||c==-1) 18 count--; 19 20 } 21 fclose(fp); 22 printf("data4.txt中共包含字符数(不计空白符):%d",count); 23 return 0; 24 }
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_pass, cnt); // 输出到屏幕 35 foutput(stu_pass, cnt); // 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("C://Users//Dell//Desktop//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("C://Users//Dell//Desktop//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 // 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 94 int process(STU st[], int n, STU st_pass[]) { 95 int i,j=0,count=0; 96 for(i=0;i<n;i++) 97 { 98 st[i].sum=st[i].objective+st[i].subjective; 99 if(st[i].sum>=60) 100 { 101 strcpy(st[i].ans,"pass"); 102 st_pass[j++]=st[i]; 103 count++; 104 } 105 else 106 strcpy(st[i].ans,"fail"); 107 } 108 return count; 109 }
task6
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<time.h> 4 #define N 100 5 typedef struct{ 6 char num[N]; 7 char name[N]; 8 char cla[N]; 9 10 }Inf; 11 12 int main() 13 { 14 int i,j,k=0,m,fla; 15 int flag[5]={80,80,80,80,80}; 16 Inf x[N],y[N]; 17 FILE *fp1,*fp2; 18 fp1=fopen("C://Users//Dell//Desktop//list.txt","r"); 19 if(fp1==NULL) 20 { 21 printf("fail to open file\n"); 22 return 1; 23 } 24 for(i=0;i<80;i++) 25 { 26 fscanf(fp1,"%s%s%s",x[i].num,x[i].name,x[i].cla); 27 } 28 fclose(fp1); 29 srand(time(0)); 30 j=rand()%80; 31 flag[0]=j; 32 y[0]=x[j]; 33 for(i=1;i<5;i++) 34 { 35 fla=0; 36 j=rand()%80; 37 for(m=0;m<5;m++) 38 { 39 if(flag[m]==j) 40 { 41 fla=1; 42 break; 43 } 44 } 45 if(fla==0) 46 { 47 y[i]=x[j]; 48 flag[k++]=j; 49 } 50 else 51 i--; 52 } 53 fp2=fopen("C://Users//Dell//Desktop//lucky.txt","w"); 54 if(fp2==NULL) 55 { 56 printf("fail to open file\n"); 57 return 1; 58 } 59 for(i=0;i<5;i++) 60 fprintf(fp2,"%s %s %s\n",y[i].num,y[i].name,y[i].cla); 61 fclose(fp2); 62 for(i=0;i<5;i++) 63 printf("%s %s %s\n",y[i].num,y[i].name,y[i].cla); 64 return 0; 65 }
标签:int,printf,st,STU,实验,pass,t% From: https://www.cnblogs.com/yzby-/p/18262896