task4
#include<stdio.h> int main(){ FILE *fp; int i,k=0; char a[1000]; fp=fopen("data4.txt","r"); if(!fp){ printf("找不到文件"); return 1; } for(i=0;!(feof(fp));i++){ a[i]=fgetc(fp); } for(i=0;a[i];i++){ printf("%c",a[i]); if(a[i]!=' '&&a[i]!='\t'&&a[i]!='\n') k++; } printf("%d",k-1); fclose(fp); return 0; }
task5
#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,num=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"); num++; } else strcpy(st[i].ans,"fail"); } return num; }
task6
#include<stdio.h> #include <stdlib.h> #include <time.h> typedef struct{ char num[10]; char name[21]; char class_[40]; } STU; int main(){ int i; STU st[80]; FILE *f1,*f2; f1= fopen("list.txt", "r"); if (f1 == NULL) { printf("fail to open file\n"); return 1; } for (i = 0; i < 80 && fscanf(f1, "%9s %19s %39s", st[i].num, st[i].name, st[i].class_) == 3; i++) { // 使用单个循环读取文件并填充结构体数组 } fclose(f1); f2= fopen("lucky.txt", "w"); srand( time(0) ); if(f2 == NULL) { printf("fail to open file\n"); return 1; } for(i = 0; i < 5; ++i){ int random; random=rand()%81; fprintf(f2, "%-14s %-10s %s \n",st[random].num,st[random].name,st[random].class_); printf("%-14s %-10s %s \n",st[random].num,st[random].name,st[random].class_); } fclose(f2); return 0; }
task6选做
#include<stdio.h> #include <stdlib.h> #include <time.h> #include<string.h> typedef struct{ char num[10]; char name[21]; char class_[40]; } STU; void my_sort(STU a[],int n); int main(){ int i,rubbish=0; char filename[20]; STU st[80]; FILE *f1,*f2; f1= fopen("list.txt", "r"); if (f1 == NULL) { printf("fail to open file\n"); return 1; } for (i = 0; i < 80 && fscanf(f1, "%9s %19s %39s", st[i].num, st[i].name, st[i].class_) == 3; i++) { // 使用单个循环读取文件并填充结构体数组 } fclose(f1); time_t t = time(NULL); struct tm tm_info = *localtime(&t); sprintf(filename, "%04d%02d%02d.txt", tm_info.tm_year + 1900, tm_info.tm_mon + 1, tm_info.tm_mday); f2 = fopen(filename, "w"); srand( time(0) ); if(f2 == NULL) { printf("fail to open file\n"); return 1; } STU lucky[5]; int random[5]; random[0]=rand()%81; lucky[0]=st[random[0]]; int k=1; while(k<5){ random[k]=rand()%81; for(i=0;i<k;i++){ if(random[k]==random[i]) rubbish++; } if(rubbish==0){ lucky[k]=st[random[k]]; k++; } rubbish=0; } my_sort(lucky,5); for(i=0;i<5;i++){ fprintf(f2, "%-14s %-10s %s \n",lucky[i].num,lucky[i].name,lucky[i].class_); printf("%-14s %-10s %s \n",lucky[i].num,lucky[i].name,lucky[i].class_); } fclose(f2); return 0;
} void my_sort(STU a[],int n){ int i,j; STU t; for(i=0;i<n-1;i++){ for(j=0;j<n-i-1;j++){ if(strcmp(a[j].num,a[j+1].num)>0){ t=a[j]; a[j]=a[j+1]; a[j+1]=t; } } } }
标签:int,random,st,STU,实验,printf,pass From: https://www.cnblogs.com/cd1747850183/p/17912314.html