实验七
实验四
#include<stdio.h> #include<ctype.h> int main(){ FILE *fp; fp=fopen("data4.txt","r"); if(fp==NULL){ printf("打不开,有问题 \n"); return 1; } int line=0,cha=0,c; while((c=fgetc(fp))!=EOF){ if(c=='\n') line++; if(c!=' ' &&c!='\t'&&c!='\n') cha++; } if(cha>0 &&(c!='\n')) line++; printf("date4.txt 统计结果: \n"); printf("行数:\t%d\n",line); printf("字符数(不计空白符):\t%d\n",cha); fclose(fp); return 0; }

实验五
include <stdio.h> #include <string.h> #define N 10 typedef struct { long id; // 准考证号 char name[20]; // 姓名 float objective; // 客观题得分 float subjective; // 操作题得分 float sum; // 总分 char result[10]; // 考试结果 } STU; // 函数声明 void read(STU st[], int n); void write(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); read(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); // 输出所有考生完整信息到屏幕 write(stu, N); // 输出考试通过的考生信息到文件 pass_rate = 1.0 * cnt / N; printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); return 0; } // 把所有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].result); } // 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 read(STU st[], int n) { int i; FILE *fin; fin = fopen("examinee.txt", "r"); if (!fin) { printf("fail to open file\n"); return; } 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 write(STU s[], int n) { int i; FILE *fp; fp=fopen("list_pass.txt","w"); if(fp==NULL){ printf("有问题\n"); } fprintf(fp,"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++){ fprintf(fp,"%1d\t%s\t%.2f\t%.2f\t%.2f\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result); } fclose(fp); } // 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,count; count=0; for(i=0;i<n;i++){ st[i].sum=st[i].objective+st[i].subjective; if(st[i].sum>=60){ strcpy(st[i].result,"通过"); st_pass[count]=st[i]; count+=1; } else strcpy(st[i].result,"不通过"); } return count; }

s实验六
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #define STUDENT_COUNT 80 #define LINE_LENGTH 50 typedef struct { char id[15]; char name[20]; char classInfo[30]; } Student; int main() { Student students[STUDENT_COUNT]; int selected[STUDENT_COUNT] = {0}; FILE *file; int i, j; char filename[50]; // 提前声明 filename 变量 srand((unsigned int)time(NULL)); file = fopen("list.txt", "r"); if (file == NULL) { printf("无法打开 list.txt 文件!\n"); return 1; } for (i = 0; i < STUDENT_COUNT; i++) { fscanf(file, "%s %s %s", students[i].id, students[i].name, students[i].classInfo); } fclose(file); printf("-------------中奖名单-------------\n"); for (i = 0; i < 5; i++) { int lucky_index; do { lucky_index = rand() % STUDENT_COUNT; } while (selected[lucky_index] == 1); selected[lucky_index] = 1; printf("%-12s %-10s %s\n", students[lucky_index].id, students[lucky_index].name, students[lucky_index].classInfo); } printf("-------------保存到文件-------------\n"); printf("输入文件名:"); scanf("%s", filename); file = fopen(filename, "w"); if (file == NULL) { printf("无法创建文件!\n"); return 1; } for (i = 0; i < STUDENT_COUNT; i++) { if (selected[i] == 1) { fprintf(file, "%-12s %-10s %s\n", students[i].id, students[i].name, students[i].classInfo); } } fclose(file); printf("保存成功!\n"); system("pause"); return 0; }

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