task4
#include<stdio.h> int main() { char ch; FILE *fp; fp = fopen("data4.txt","r"); int count = 0; while(1) { ch = fgetc(fp); if(ch==EOF) break; if(ch==' '||ch=='\n') continue; else count++; } printf("%d\n",count); 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; int k = 0; int count = 0; for(i=0;i<n;i++) { st[i].sum = st[i].objective+st[i].subjective; if(st[i].sum>=60) { st_pass[k++] = st[i]; strcpy(st[i].ans,"pass"); } else strcpy(st[i].ans,"fail"); } return k; }
task6-1
#include<stdio.h> #include<stdlib.h> #define N 5 #define M 10 #define H 50 #define NM 10000 typedef struct { char number[M];//学号 char name[M];//姓名 char clas_now[H];//班级 }STU; int main() { int k; int i = 0; int j; STU st[NM]; FILE *fp; fp = fopen("list.txt","r"); if(fp==NULL) { printf("fail to open file\n"); return 1; } while(!feof(fp)) { fscanf(fp,"%s%s%s",st[i].number,st[i].name,st[i].clas_now); ++i; } for(k=0;k<5;k++) { j = rand()%(i-1); printf("%-20s%-20s%-20s\n",st[j].number,st[j].name,st[j].clas_now); } fclose(fp); return 0; }
6-2选做
#include<stdio.h> #include<stdlib.h> #include<time.h> #define N 100 #define M 5 typedef struct { char number[N]; //学号 char name[N]; //姓名 char clas_now[N]; //班级 }STU; int main() { int n; //用于记录成员个数 STU st[N]; //学生信息 char date[20] = {0}; //日期 int x[M]; //下标 int a[N] = {0}; //用以标记判断 int i = 0; int j; int tmp; //作为交换的介质 int m = 0; FILE*fp; //从文件中读出 fp = fopen("list.txt","r"); if(fp==NULL) { printf("fail to open the file\n"); exit(0); } while(!feof(fp)) { fscanf(fp,"%s%s%s",st[i].number,st[i].name,st[i].clas_now); i++; } n = i-1; fclose(fp); srand(time(NULL)); while(1) //生成随机数 { j = rand()%n; if(a[j]!=1) { x[m] = j; m++; a[j] = 1; } if(m==M) break; } for(i=0;i<M-1;i++) //进行排序 { for(j=0;j<M-1-i;j++) { if(st[x[j]].number>st[x[j+1]].number) { tmp = x[j]; x[j] = x[j+1]; x[j+1] = tmp; } } } time_t t; time(&t); strftime(date,sizeof(date),"%Y%m%d.txt",localtime(&t)); FILE*fpp; fpp = fopen(date,"w"); if(fpp==NULL) { printf("fail to open the file\n"); exit(0); } for(i=0;i<M;i++) { fprintf(fpp,"%-20s%-20s%-20s\n",st[x[i]].number,st[x[i]].name,st[x[i]].clas_now); } fclose(fpp); for(i=0;i<M;i++) { printf("%-20s%-20s%-20s\n",st[x[i]].number,st[x[i]].name,st[x[i]].clas_now); } return 0; }
标签:fp,int,pass,st,STU,实验,第七次,printf From: https://www.cnblogs.com/hychychyc/p/17916297.html