任务4
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
long i = 0;
char ch;
FILE* fp;
fp = fopen("c://data//data4.txt", "r");
while (!feof(fp))
{
ch = fgetc(fp);
if (ch != ' ' && ch != '\n' && ch != '\t'&&ch!=EOF)
{
i++;
}
}
printf("data4.txt中共包含字符(不计空字符):%ld",i);
fclose(fp);
return 0;
}
任务五
1 #define _CRT_SECURE_NO_WARNINGS 2 #include <stdio.h> 3 #include <string.h> 4 #include <stdlib.h> 5 6 #define N 10 7 8 typedef struct { 9 long int id; 10 char name[20]; 11 float objective; // 客观题得分 12 float subjective; // 操作题得分 13 float sum; // 总分 14 char ans[10]; // 考试结果 15 } STU; 16 17 // 函数声明 18 void finput(STU st[], int n); 19 void foutput(STU st[], int n); 20 void output(STU st[], int n); 21 int process(STU st[], int n, STU st_pass[]); 22 23 int main() { 24 STU stu[N], stu_pass[N]; 25 int cnt; 26 double pass_rate; 27 28 printf("从文件读入%d个考生信息...\n", N); 29 finput(stu, N); 30 31 printf("\n对考生成绩进行统计...\n"); 32 cnt = process(stu, N, stu_pass); 33 34 printf("\n通过考试的名单:\n"); 35 output(stu, N); // 输出到屏幕 36 foutput(stu, N); // 输出到文件 37 38 pass_rate = 1.0 * cnt / N; 39 printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); 40 41 return 0; 42 } 43 44 // 把通过考试的考生完整信息输出到屏幕上 45 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 46 void output(STU st[], int n) { 47 int i; 48 49 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"); 50 for (i = 0; i < n; i++) 51 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); 52 } 53 54 // 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 55 void finput(STU st[], int n) { 56 int i; 57 FILE *fin; 58 59 fin = fopen("c:\\data\\examinee.txt", "r"); 60 if (fin == NULL) { 61 printf("fail to open file\n"); 62 exit(0); 63 } 64 65 while (!feof(fin)) { 66 for (i = 0; i < n; i++) 67 fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective); 68 } 69 70 fclose(fin); 71 } 72 73 // 把通过考试的考生完整信息写入文件list_pass.txt 74 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 75 void foutput(STU s[], int n) { 76 FILE *fout; 77 int i; 78 79 // 保存到文件 80 fout = fopen("list_pass.txt", "w"); 81 if (!fout) { 82 printf("fail to open or create list_pass.txt\n"); 83 exit(0); 84 } 85 86 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"); 87 88 for (i = 0; i < n; i++) 89 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); 90 91 fclose(fout); 92 } 93 94 95 96 // 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 97 int process(STU st[], int n, STU st_pass[]) { 98 int i; 99 int j = 0; 100 for (i = 0; i < n; i++) 101 { 102 st[i].sum = st[i].objective + st[i].subjective; 103 } 104 for (i = 0; i < n; i++) 105 { 106 if (st[i].sum >= 60) 107 { 108 st_pass[j++] = st[i]; 109 strcpy(st[i].ans, "合格"); 110 } 111 else 112 { 113 strcpy(st[i].ans, "不合格"); 114 } 115 } 116 return j; 117 }
任务六
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<time.h> 4 5 typedef struct{ 6 long int num; 7 char name[10]; 8 char cla[20]; 9 }student; 10 11 int main() { 12 srand(time(NULL)); 13 int i,cnt,n; 14 student st[100]; 15 student lucky[5]; 16 17 FILE *fp,*f; 18 fp=fopen("list.txt","r"); 19 20 if(fp==NULL){ 21 printf("fail to open file\n"); 22 exit(0); 23 } 24 25 while (!feof(fp)) { 26 for(i=0;i<100;i++){ 27 fscanf(fp,"%ld %s %s",&st[i].num,st[i].name,st[i].cla); 28 } 29 } 30 cnt=sizeof(st)/sizeof(student); 31 32 f=fopen("lucky.txt","w"); 33 for(i=0;i<5;++i){ 34 n=rand()%cnt; 35 fprintf(f,"%-20ld%-20s%-30s",st[n].num,st[n].name,st[n].cla); 36 fprintf(f,"\n"); 37 lucky[i]=st[n]; 38 printf("%-20ld%-20s%-30s\n",lucky[i].num,lucky[i].name,lucky[i].cla); 39 } 40 41 42 fclose(fp); 43 fclose(f); 44 return 0; 45 }
标签:int,printf,st,STU,实验,pass,t% From: https://www.cnblogs.com/sanski/p/17901651.html