任务四:
源代码:
#include <stdio.h> int main() { int line_count=1,char_count=0; FILE *fp=fopen("data4.txt","r"); while(!feof(fp)) { char ch=fgetc(fp); if(ch==EOF) break; if(ch=='\n') line_count++; else if(!(ch=='\t'||ch==' ')) char_count++; } fclose(fp); printf("data4.txt统计结果:\n行数:%d\n字符数(不计空白符):%d",line_count,char_count); return 0; }
运行结果:
任务五:
源代码:
#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) { // 待补足 int i; FILE *fp; fp=fopen("list_pass.txt","w"); if(!fp){ printf("fail to open file\n"); return; } fprintf(fp, "%-15s%-25s%-20s%-20s%-20s%-20s\n","准考证号","姓名","客观题得分","操作题得分","总分","结果"); for(i=0;i<n;i++){ if(strcmp(s[i].result,"通过")==0) fprintf(fp, "%-15ld%-25s%-20.2f%-20.2f%-20.2f%-20s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result); } fclose(fp); } // 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,j; for(i=0,j=0;i<n;i++){ st[i].sum=st[i].objective+st[i].subjective; if(st[i].sum>=60){ strcpy(st[i].result,"通过"); st_pass[j++]=st[i]; } else{ strcpy(st[i].result,"未通过"); } } return j; }
运行结果:
任务六:
必做部分
源代码:
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 80 typedef struct{ char id[10]; char name[10]; char class[20]; }stu; void read(stu s[N]); void choose(stu s[],int n); int main() { stu s[N]; int i; read(s); choose(s,N); return 0; } void read(stu s[N]){ int i=0; FILE *fin; fin=fopen("list.txt","r"); if(!fin){ printf("fail to open file\n"); return; } while(fscanf(fin, "%s %s %s", s[i].id, s[i].name, s[i].class) != EOF) i++; fclose(fin); } void choose(stu s[],int n){ FILE *fp; int i,j,k=0,g; int c[5]; char filename[20]; srand(time(NULL)); for (i = 0; k< 5; i++) { j=rand()%n; int is_duplicate = 0; for(g=0;g<k;g++){ if(j==c[g]) is_duplicate = 1; break; } if (!is_duplicate) c[k++]=j; } printf("------------------随机抽点名单------------------\n"); for (i = 0; i < 5; i++) { printf("%s\t%s\t%s\n", s[c[i]].id, s[c[i]].name, s[c[i]].class); } printf("\n------------------保存到文件------------------\n"); printf("输入文件名: "); scanf("%s",filename); fp=fopen(filename,"w"); if(!fp){ printf("fail to open the file"); return; } for (i = 0; i < 5; i++) { fprintf(fp,"%s\t%s\t%s\n", s[c[i]].id, s[c[i]].name, s[c[i]].class); } fclose(fp); printf("保存成功!\n"); }
运行结果;
选做部分:
源代码:
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 80 typedef struct { char id[10]; char name[10]; char class[20]; } stu; void read(stu s[N]); void choose(stu s[], int n); void generate_filename(char *filename); int main() { stu s[N]; read(s); choose(s, N); return 0; } void read(stu s[N]) { int i = 0; FILE *fin; fin = fopen("list.txt", "r"); if (!fin) { printf("fail to open file\n"); return; } while (fscanf(fin, "%s %s %s", s[i].id, s[i].name, s[i].class) != EOF) i++; fclose(fin); } void choose(stu s[], int n) { FILE *fp; int i, j, k = 0, g; stu t; stu selected[5]; int c[5]; char filename[20]; srand(time(NULL)); for (i = 0; k < 5; i++) { j = rand() % n; int is_duplicate = 0; for (g = 0; g < k; g++) { if (j == c[g]) { is_duplicate = 1; break; } } if (!is_duplicate) c[k++] = j; } for (i = 0; i < 5; i++) { selected[i] = s[c[i]]; } for (i = 0; i < k; i++) { for (j = 0; j < k - 1 - i; j++) { if (strcmp(selected[j].id, selected[j + 1].id) > 0) { t = selected[j]; selected[j] = selected[j + 1]; selected[j + 1] = t; } } } printf("------------------随机抽点名单------------------\n"); for (i = 0; i < 5; i++) { printf("%s\t%s\t%s\n", selected[i].id, selected[i].name, selected[i].class); } printf("\n------------------保存到文件------------------\n"); generate_filename(filename); fp = fopen(filename, "w"); if (!fp) { printf("fail to open the file"); return; } for (i = 0; i < 5; i++) { fprintf(fp, "%s\t%s\t%s\n", selected[i].id, selected[i].name, selected[i].class); } fclose(fp); printf("保存成功!\n"); } void generate_filename(char *filename) { time_t now; struct tm *local; char date[20]; time(&now); local = localtime(&now); strftime(date, sizeof(date), "%Y%m%d", local); sprintf(filename, "%s.txt", date); }
运行结果:
#include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 5 #define N 80 6 7 typedef struct{ 8 char id[10]; 9 char name[10]; 10 char class[20]; 11 }stu; 12 13 void read(stu s[N]); 15 void choose(stu s[],int n); 16 17 int main() { 18 stu s[N]; 19 int i; 20 21 read(s); 22 choose(s,N); 23 24 return 0; 25 } 26 27 void read(stu s[N]){ 28 int i=0; 29 FILE *fin; 30 fin=fopen("list.txt","r"); 31 if(!fin){ 32 printf("fail to open file\n"); 33 return; 34 } 35 36 while(fscanf(fin, "%s %s %s", s[i].id, s[i].name, s[i].class) != EOF) 37 i++; 38 39 fclose(fin); 40 } 41 42 void choose(stu s[],int n){ 43 FILE *fp; 44 45 int i,j,k=0,g; 46 int c[5]; 47 char filename[20]; 49 srand(time(NULL)); 50 52 for (i = 0; k< 5; i++) { 53 j=rand()%n; 54 int is_duplicate = 0; 55 for(g=0;g<k;g++){ 56 if(j==c[g]) 57 is_duplicate = 1; 58 break; 59 } 60 if (!is_duplicate) 61 c[k++]=j; 62 } 63 64 printf("------------------随机抽点名单------------------\n"); 65 for (i = 0; i < 5; i++) { 66 printf("%s\t%s\t%s\n", s[c[i]].id, s[c[i]].name, s[c[i]].class); 67 } 68 69 printf("\n------------------保存到文件------------------\n"); 70 printf("输入文件名: "); 71 scanf("%s",filename); 72 fp=fopen(filename,"w"); 73 if(!fp){ 74 printf("fail to open the file"); 75 return; 76 } 77 for (i = 0; i < 5; i++) { 78 fprintf(fp,"%s\t%s\t%s\n", s[c[i]].id, s[c[i]].name, s[c[i]].class); 79 } 80 fclose(fp); 81 printf("保存成功!\n"); 82 83 84 85 }标签:int,void,st,char,stu,实验,fin From: https://www.cnblogs.com/hcjinniuzuo/p/18638751