实验7
#define _CRT_SECURE_NO_WARNINGS #include<stdio.h> #include<stdlib.h> #include <stdio.h> #include <string.h> #define N 100 #define M 100 int main() { FILE* fp; fp = fopen("data4.txt", "r"); if (fp == NULL) { printf("无法打开文件\n"); return 1; } int count = 0; char b; while ((b = fgetc(fp)) != EOF) if (b != ' ' && b != '\n') count++; printf("文件内字符数为%d\n", count); fclose(fp); return 0; }
#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("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 = 0; int 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].ans, "pass"); st_pass[count++] = st[i]; } else strcpy(st[i].ans, "fail"); } return count; }
#define _CRT_SECURE_NO_WARNINGS #include<stdio.h> #include<stdlib.h> #include<time.h> int main() { FILE* fp; fp = fopen("list.txt", "r"); if (fp == NULL) { printf("无法打开文件"); exit(0); } int i; char a[80][100]; for (i = 0; i < 80; i++) { fgets(a[i], 100, fp); } FILE* fp2; fp2 = fopen("lucky.txt", "w"); if (fp2 == NULL) { printf("failed"); exit(0); } srand(time(NULL)); for (i = 0; i < 5; i++) { int t = 0; t = rand() % 81; fprintf(fp2, "%s", a[t]); printf("%s", a[t]); } return 0; }
#define _CRT_SECURE_NO_WARNINGS #include<stdio.h> #include<stdlib.h> #include<time.h> #include<string.h> int main() { FILE* fp1,*fp2; fp1 = fopen("list.txt", "r"); if (fp1 == NULL) { printf("failed"); exit(0); } int i; char a[80][100]; for (i = 0; i < 80; i++) { fgets(a[i], 100, fp1); } char Time[20]; time_t timer; timer = time(NULL); strftime(Time, 20, "%Y.%m.%d", localtime(&timer)); fp2 = fopen(Time, "w");//开只写文件 if (fp2 == NULL) { printf("failed"); exit(0); } char b[5][100]; srand((double)time(NULL)); for (i = 0; i < 5;) { int t = 0; t = rand() % 81; if (strcmp(a[t], " ")) { strcpy(b[i], a[t]); strcpy(a[t], " "); i++; } } int j; for (i = 0; i < 5 - 1; i++) { for (j = 0; j < 5- i - 1; j++) { if (strcmp(b[j], b[j + 1]) > 0) { char c[100]; strcpy(c, b[j]); strcpy(b[j], b[j + 1]); strcpy(b[j + 1], c); } } } for (i = 0; i < 5; i++) { fprintf(fp2, "%s", b[i]); puts(b[i]); } return 0; }