本文实例为大家分享了C语言实现文件读写操作的具体代码,供大家参考,具体内容如下
键盘读入字符串写到文件中,再从文件读出显示在控制台
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
#include<stdio.h> #include<string.h> int main() { FILE *fp; char string[6]; //方括号中是几就输入几个字符串 if ( (fp= fopen ( "file.txt" , "w" ))==NULL ) { printf ( "cannot open file" ); return 0; } while ( strlen ( gets (string)) > 0) { fputs (string,fp); fputs ( "\n" ,fp); } fclose (fp); if ( (fp= fopen ( "file.txt" , "r" ))==NULL) { printf ( "cannot open file\n" ); return 0; } while ( fgets (string,6,fp)!=NULL) { fputs (string,stdout); //系统自动打开stdout文件 } fclose (fp); } |
合并两个文件的内容,并输出到第三个文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#include<stdio.h> #include<string.h> int main() { FILE *fp1,*fp2,*fp3; char str1[10],str2[10]; printf ( "输入两串字母\n" ); scanf ( "%s" ,str1); scanf ( "%s" ,str2); //A,B两个文件赋值 if ((fp1= fopen ( "A.txt" , "w" ))==NULL) { printf ( "cannot open file\n" ); return 0; } fputs (str1,fp1); fclose (fp1); if ((fp2= fopen ( "B.txt" , "w" ))==NULL) { printf ( "cannot open file\n" ); return 0; } fputs (str2,fp2); fclose (fp2); //拷贝到第三个文件 if ((fp1= fopen ( "A.txt" , "r" ))==NULL) { printf ( "cannot open file\n" ); return 0; } if ((fp2= fopen ( "B.txt" , "r" ))==NULL) { printf ( "cannot open file\n" ); return 0; } if ((fp3= fopen ( "C.txt" , "a" ))==NULL) { printf ( "cannot open file\n" ); return 0; } while (! feof (fp1)) { fputc ( fgetc (fp1),fp3); } while (! feof (fp2)) { fputc ( fgetc (fp2),fp3); } fclose (fp1); fclose (fp2); fclose (fp3); } |
输入学生信息并转存到磁盘文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
#include<stdio.h> #define SIZE 4 struct student_type { char name[10]; int num; int age; char addr[15]; }; struct student_type stud[SIZE]; void save(); void display(); void main() { int i; for (i=0;i<SIZE;i++) { scanf ( "%s %d %d %s" ,stud[i].name, &stud[i].num, &stud[i].age, stud[i].addr); } save(); //转存 display(); } void save() { FILE *fp; int i; if ((fp= fopen ( "E:\\计算机导论作业\\加密文档" , "wb" ))==NULL) { printf ( "cannot open file\n" ); return ; } for (i=0;i<SIZE;i++) { if ( fwrite (&stud[i], sizeof ( struct student_type),1,fp)!=1) printf ( "file write error\n" ); } fclose (fp); } void display() { FILE *fp; int i; if ((fp= fopen ( "E:\\计算机导论作业\\加密文档" , "rb" ))==NULL) { printf ( "cannot open file\n" ); return ; } for (i=0;i<SIZE;i++) { fread (&stud[i], sizeof ( struct student_type), 1, fp); printf ( "%-10s %4d %4d %-15s\n" ,stud[i].name, stud[i].num, stud[i].age, stud[i].addr); } fclose (fp); } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_42316621/article/details/100065257