程式碼示例：

#include

<stdio.h>

#include

<stdlib.h>

#include

<string.h>

typedef

struct

STU_INFO

{

char

stuNo[7];

char

stuName[11];

}

STU_INFO;

int

main(int

argc,

char

*argv[])

{

FILE

*in,

*out;

char

stuNo[7];

char

stuName[11];

STU_INFO

info;

char

*filePath

=

"c:/stu.dat";

if

((out

=

fopen(filePath,

"a+"))

==

NULL)

{

printf("open

file

error");

return

-1;

}

printf("請輸bai入du0結束\n");

while(1)

{

printf("請輸入學號(長度6)

exac

100000:\n");

scanf("%s",

stuNo);

if

(atol(stuNo)

==

0)

{

break;

}

else

if

(atol(stuNo)

&&

strlen(stuNo)

==

6)

{

printf("請輸入姓名(長度<=10)

exac

張三:\n");

scanf("%s",

stuName);

fprintf(out,

"%s,%s\n",

stuNo,

stuName);

}

else

{

printf("輸入錯誤\n");

continue;

}

}

fclose(out);

printf("\n

請輸入要查詢的zhi學號：dao\n");

scanf("%s",

stuNo);

if

((in

=

fopen(filePath,

"r"))

==

NULL)

{

printf("open

file

error");

return

-1;

}

while

(!feof(in))

{

fscanf(in,

"%6s,%s",

info.stuNo,

info.stuName);

if

(atol(stuNo)

==

atol(info.stuNo))

{

printf("學號：%s

姓名：%s\n",

info.stuNo,

info.stuName);

break;

}

}

if

(feof(in))

{

printf("不存在這個學生！！！\n");

}

fclose(in);

return

0;

}