task4
1 #include <stdio.h> 2 3 int main() { 4 5 int i=0; 6 char s; 7 8 FILE *fp; 9 fp=fopen("data4.txt","r"); 10 11 while(1){ 12 s=fgetc(fp); 13 if(s==EOF){ 14 break; 15 } 16 else if(s==' '||s=='\n'){ 17 i--; 18 } 19 i++; 20 } 21 22 printf("data4.txt中字符串数(空格除外)%d",i); 23 24 fclose(fp); 25 return 0; 26 }
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,cnt=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");
st_pass[cnt++]=st[i];
}
else{
strcpy(st[i].ans,"fail");
}
}
return cnt;
}
task6
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/nuist6/p/17908803.html