4.task.4
#include<stdio.h> int main(){ FILE *fp; char ch; int count=0; fp=fopen("d:\\data4.txt","r"); if(fp==NULL){ printf("fail to open file\n"); return 0; } while(!feof(fp)){ ch = fgetc(fp); if(ch!=' '&& ch!='\n' && ch!=EOF) count++; } fclose(fp); printf("data4.txt中共包含字符数(不计空白符):%d",count); return 0; }
5.task.5
#include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { long int id; char name[20]; float objective; // 客观题得分 float subjective; // 操作题得分 float sum; // 总分 char ans[10]; // 考试结果 } STU; // 函数声明 void finput(STU st[], int n); void foutput(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); finput(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_pass, cnt); // 输出到屏幕 foutput(stu_pass, cnt); // 输出到文件 pass_rate = 1.0 * cnt / N; printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); return 0; } // 把通过考试的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].ans); } // 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 finput(STU st[], int n) { int i; FILE *fin; fin = fopen("d:\\examinee.txt", "r"); if (fin == NULL) { printf("fail to open file\n"); exit(0); } 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 foutput(STU s[], int n) { FILE *fout; int i; // 保存到文件 fout = fopen("list_pass.txt", "w"); if (!fout) { printf("fail to open or create list_pass.txt\n"); exit(0); } 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"); for (i = 0; i < n; i++) 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); fclose(fout); } // 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,j=0; for(i=0;i<n;i++){ st[i].sum=st[i].objective+st[i].subjective; if(st[i].sum>=60) {strcpy(st[i].ans,"pass"); st_pass[j++]=st[i]; } else strcpy(st[i].ans,"fail"); } return j; }
6.task.6
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/940804telck/p/18264418