实验七
#include<stdio.h> int main(){ FILE *fp; int sum=0; char ch; fp=fopen("data4.txt","r"); if(fp==NULL){ printf("不能打开文件\n"); return 1; } ch=fgetc(fp); while((ch=fgetc(fp))!=EOF){ if(ch!=' '&&ch!='\t'){ ++sum; } } fclose(fp); printf("文件中字符数为:%d",sum); return 0; }
task 4
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("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[]) { // 待补足 // ××× int i; 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; }
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 100 struct STU { long int id; char name[N]; char cla[N]; } st[N], lucky[N]; void func1(void); int func2(void); void func3(void); int main() { int j, n; func1(); srand((unsigned)time(NULL)); for (j = 0; j < 5; j++) { n = func2(); lucky[j] = st[n]; printf("%ld\t %s\t %s\t\n", lucky[j].id, lucky[j].name, lucky[j].cla); } func3(); getchar(); return 0; } void func1(void) { int i; FILE *fp; fp = fopen("list.txt", "r"); if (fp == NULL) { printf("Failed to open file\n"); return; } i = 0; while (fscanf(fp, "%ld %s %s", &st[i].id, st[i].name, st[i].cla) == 3 && i < N) { ++i; } fclose(fp); } int func2(void) { return rand() % 80; } void func3(void) { int j; FILE *fout; fout = fopen("lucky.txt", "w"); if (fout == NULL) { printf("Failed to open file\n"); return; } for (j = 0; j < 5; j++) { fprintf(fout, "%ld\t %s\t %s\t\n", lucky[j].id, lucky[j].name, lucky[j].cla); } fclose(fout); }