#include<stdio.h>
struct student
{
    char name[10];
    char sex;
    int phone;
    char adress[20];
    int QQ;
};

int main()
{
    int i;
    struct student stu[10]={{"Lily",'W',111123,"apple road",56443256},
    {"Bob",'M',656411,"banaba road",83254467},
    {"Tom",'M',897523,"tower road",564432123},
    {"Kity",'W',495821,"rain road",56458369},
    {"Tony",'M',367498,"gold road",564454781},
    {"Sed",'M',232599,"air road",294658715}};
FILE*fp;
    fp=fopen("D:\\"stu.dat","wb");
    for(i=0;i<10;i++)
        fread(&student[10],sizeof(struct student),1,fp);
    fclose(fp);
for (i=0;i<10;i++)

printf("%s\t%c\t%5d\t%s\t%5d\n",stu[i].name,stu[i].sex,stu[i].phone,stu[i].adress,stu[i].QQ);
return 0;
}





í¨Ñ¶Â¼.cpp
C:\Users\Administrator\Desktop\Debug\D½¨Îļt¼D (10)\í¨Ñ¶Â¼.cpp(22) : error C2146: syntax error : missing ')' before identifier 'stu'
C:\Users\Administrator\Desktop\Debug\D½¨Îļt¼D (10)\í¨Ñ¶Â¼.cpp(22) : error C2660: 'fopen' : function does not take 1 parameters
C:\Users\Administrator\Desktop\Debug\D½¨Îļt¼D (10)\í¨Ñ¶Â¼.cpp(22) : error C2001: newline in constant
C:\Users\Administrator\Desktop\Debug\D½¨Îļt¼D (10)\í¨Ñ¶Â¼.cpp(23) : warning C4552: '<' : operator has no effect; expected operator with side-effect
C:\Users\Administrator\Desktop\Debug\D½¨Îļt¼D (10)\í¨Ñ¶Â¼.cpp(23) : error C2143: syntax error : missing ';' before ')'
Ö′DD cl.exe ê±3ö′í.

í¨Ñ¶Â¼.exe - 1 error(s), 0 warning(s)

这样试试

#include<stdio.h>
struct student
{
    char name[10];
    char sex;
    int phone;
    char adress[20];
    int QQ;
};

int main()
{FILE *fp;
    int i;
    struct student stu[10]={{"Lily",'W',111123,"apple road",56443256},
    {"Bob",'M',656411,"banaba road",83254467},
    {"Tom",'M',897523,"tower road",564432123},
    {"Kity",'W',495821,"rain road",56458369},
    {"Tony",'M',367498,"gold road",564454781},
    {"Sed",'M',232599,"air road",294658715}};

    fp=fopen("D:\\stu.txt","wb");
    for(i=0;i<10;i++)
        fwrite(&stu[0],sizeof(struct student),1,fp);
    fclose(fp);
for (i=0;i<10;i++)

printf("%s\t%c\t%5d\t%s\t%5d\n",stu[i].name,stu[i].sex,stu[i].phone,stu[i].adress,stu[i].QQ);
return 0;
}

马小虎楼主

声明必须放在函数开头，貌似C99之后是变了吧？我看书说的

哦哦。其实这些问题我都不太明白 - -。又好好看了看书。请问为何我程序运行之后在D盘建立的txt文件中是乱码？

刚学到这点上,学习了！！！！

#include<stdio.h>
struct student
{
    char name[10];
    char sex;
    long phone;
    char adress[20];
   long QQ;
};

int main()
{FILE *fp;
    int i;
    struct student stu[10]={{"Lily",'W',111123,"apple road",56443256},
    {"Bob",'M',656411,"banaba road",83254467},
    {"Tom",'M',897523,"tower road",564432123},
    {"Kity",'W',495821,"rain road",56458369},
    {"Tony",'M',367498,"gold road",564454781},
    {"Sed",'M',232599,"air road",294658715}};

    fp=fopen("D:\\stu.txt","wb");
    for(i=0;i<10;i++)
        fprintf(fp,"%s  %c  %ld  %s  %ld",stu[i].name,stu[i].sex,stu[i].phone,stu[i].adress,stu[i].QQ);
    fclose(fp);
for (i=0;i<10;i++)

printf("%s\t%c\t%5d\t%s\t%5d\n",stu[i].name,stu[i].sex,stu[i].phone,stu[i].adress,stu[i].QQ);
return 0;
}

数据类型不匹配，int只有5位，fwrite不能格式写入