实验七
4.任务4
#include <stdio.h> int main() { int i=0; char s; FILE *fp; fp=fopen("D:\\hhh\\data4.txt","r"); while(1){ s=fgetc(fp); if(s==EOF){ break; } else if(s==' '||s=='\n'){ i--; } i++; } printf("data4.txt中字符串数(空格除外)%d",i); fclose(fp); return 0; }
5.实验5
#define _CRT_SECURE_NO_WARNINGS #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, N); // 输出到屏幕 foutput(stu, N); // 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:\\hhh\\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; int j = 0; for (i = 0; i < n; i++) { st[i].sum = st[i].objective + st[i].subjective; } for (i = 0; i < n; i++) { if (st[i].sum >= 60) { st_pass[j++] = st[i]; strcpy(st[i].ans, "合格"); } else { strcpy(st[i].ans, "不合格"); } } return j; }
6.任务6
#include<stdio.h> #include<stdlib.h> #include<time.h> typedef struct{ long int num; char name[10]; char cla[20]; }student; int main() { srand(time(NULL)); int i,cnt,n; student st[100]; student lucky[5]; FILE *fp,*f; fp=fopen("D:\\hhh\\list.txt","r"); if(fp==NULL){ printf("fail to open file\n"); exit(0); } while (!feof(fp)) { for(i=0;i<100;i++){ fscanf(fp,"%ld %s %s",&st[i].num,st[i].name,st[i].cla); } } cnt=sizeof(st)/sizeof(student); f=fopen("lucky.txt","w"); for(i=0;i<5;++i){ n=rand()%cnt; fprintf(f,"%-20ld%-20s%-30s",st[n].num,st[n].name,st[n].cla); fprintf(f,"\n"); lucky[i]=st[n]; printf("%-20ld%-20s%-30s\n",lucky[i].num,lucky[i].name,lucky[i].cla); } fclose(fp); fclose(f); return 0; }