实验1.2
有,原因是越界。
实验4
1 #include<stdio.h> 2 int main() 3 { 4 char ch; 5 int count = 0; 6 FILE* fp; 7 fp = fopen("\\data4.txt", "r"); 8 if (fp == NULL) 9 { 10 printf("fail to open file\n"); 11 return 1; 12 } 13 while (1) 14 { 15 ch = fgetc(fp); 16 if (ch == EOF) 17 break; 18 if (ch == '\n' || ch == ' ') 19 count--; 20 ++count; 21 } 22 printf("data.txt中共包含的字符数(不计空白符):%d\n", count); 23 }
实验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, 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("\\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 count = 0, i, j; STU t; FILE* fout; fout = fopen("\\list_pass.txt", "r+"); for (i = 0; i < n; i++) st[i].sum = st[i].objective + st[i].subjective; for (i = 0, j = 0; i < n; i++) { if (st[i].sum >= 60) { strcpy(st[i].ans, "pass"); count++; st_pass[j++] = st[i]; } else { strcpy(st[i].ans, "fail"); } } fclose(fout); return count; }
实验6
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<math.h> 4 #include <time.h> 5 #define N 80 6 #define M 5 7 8 typedef struct 9 { 10 int id; 11 char name[20]; 12 char class_name[80]; 13 }STU; 14 15 void samp(STU x, int n) 16 { 17 18 } 19 int main() 20 { 21 STU stu[N]; 22 int i, num; 23 FILE* fp; 24 fp = fopen("\\list.txt", "r"); 25 if (fp == NULL) 26 { 27 printf("file open fail\n"); 28 return 1; 29 } 30 i = 0; 31 while (!feof(fp)) { 32 fscanf(fp, "%d%s%s", &stu[i].id, stu[i].name, stu[i].class_name); 33 i++; 34 } 35 fclose(fp); 36 fp = fopen("\\lucky.txt", "w"); 37 srand((double)time(NULL));//srand(time(0)) 38 for (i = 0; i < M; i++) 39 { 40 num = rand() % (N); 41 fprintf(fp, "%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class_name); 42 printf("%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class_name); 43 } 44 fclose(fp); 45 }
标签:STU,int,st,stu,实验,pass,t% From: https://www.cnblogs.com/huangyi-bit/p/17918760.html