实验7
#include <stdio.h> #include <stdlib.h> int is_word(char x); int main(){ FILE *fp; char ch; int i,line=1,count=0; fp=fopen("d:\\data4.txt","r"); if(!fp) { printf("fail to open file to read\n"); return 0; } while((ch=fgetc(fp))!=EOF) { if(is_word(ch)) { count++; } if(ch=='\n') { line++; } } fclose(fp); printf("统计结果:\n"); printf("行数: %20d\n", line); printf("字符数(不计空白符): %7d\n", count); return 0; } int is_word(char x) { if(x!='\n'&&x!=' '&&x!='\t') return 1; else return 0; }
#include <stdio.h> #include <string.h> #define N 10 typedef struct { long id; // 准考证号 char name[20]; // 姓名 float objective; // 客观题得分 float subjective; // 操作题得分 float sum; // 总分 char result[10]; // 考试结果 } STU; // 函数声明 void read(STU st[], int n); void write(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); read(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); // 输出所有考生完整信息到屏幕 write(stu, N); // 输出考试通过的考生信息到文件 pass_rate = 1.0 * cnt / N; printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); return 0; } // 把所有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].result); } // 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 read(STU st[], int n) { int i; FILE *fin; fin = fopen("examinee.txt", "r"); if (!fin) { printf("fail to open file\n"); return; } 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 write(STU s[], int n) { int i; FILE *fout; fout = fopen("list_pass.txt", "w"); if (!fout) { perror("fail to open file list_pass.txt"); return; } fprintf(fout, "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++) { if (s[i].sum >= 60) { 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].result); } } 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, count = 0; for (i = 0; i < n; i++) { st[i].sum = st[i].objective + st[i].subjective; st[i].sum = (float)((int)(st[i].sum * 100 + 0.5)) / 100; if (st[i].sum >= 60) { strcpy(st[i].result, "通过"); st_pass[count] = st[i]; count++; } else { strcpy(st[i].result, "未通过"); } } return count; }
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 80 typedef struct{ long int id; char name[20]; char class_name[30]; }STU; int repeated(STU st[],STU random_select[],int random_index,int n); void read(STU st[],int n); void process(STU st[],int n,STU random_select[]); void output(STU st[],int n); int write(STU st[],int n,char *file_name); int main() { STU stu[N],stu_select[N]; char file_name[20]; read(stu,N); process(stu,N,stu_select); printf("--------------随机抽点名单--------------\n"); output(stu_select,5); printf("---------------保存到文件---------------\n"); printf("输入文件名:"); scanf("%s",file_name); if(write(stu_select,5,file_name)) printf("保存成功!\n"); else printf("保存失败!\n"); return 0; } void output(STU st[],int n) { int i; for (i = 0; i < n; i++) printf("%ld\t%s\t%s\n", st[i].id, st[i].name, st[i].class_name); } void read(STU st[],int n) { int i; FILE *fin; fin = fopen("d:\\list.txt", "r"); if (!fin) { printf("fail to open file\n"); return; } while (!feof(fin)) { for (i = 0; i < n; i++) fscanf(fin, "%ld %s %s", &st[i].id, st[i].name, st[i].class_name); } fclose(fin); } void process(STU st[], int n, STU random_select[]) { int i,random_index; srand((unsigned int)time(NULL)); for(i=0;i<5;i++) { random_index=rand()%n; while(repeated(st,random_select,random_index,i)) { random_index=rand()%n; } random_select[i] = st[random_index]; } } int write(STU st[], int n,char *file_name) { int i; FILE *fp; fp=fopen(file_name,"w"); if(fp==NULL) { printf("fail to open file to write\n"); return; } for (i = 0; i < n; i++) fprintf(fp,"%ld\t\t%10s\t\t%10s\n", st[i].id, st[i].name, st[i].class_name); fclose(fp); return 1; } int repeated(STU st[],STU random_select[],int random_index,int n) { int i; for(i=0;i<n;i++) { if(st[random_index].id==random_select[i].id) return 1; } return 0; }