在TC中~#include#include#include#include#includecharstr[10];staticcharstr2[10]="1234";structstudent{intnum;char*name;longphone...

在TC中~

#include

#include

#include

#include

#include

char str[10];

static char str2[10]="1234";

struct student

{

int num;

char *name;

long phone;

char *homework;

};

student stu1;

void input()

{

FILE *fp;

if((fp=fopen("D:\\stu1.txt","at+"))==NULL)

{

printf("Cannot open file,strike any key exit!");

getch();

exit(1);

}

printf("please input the student's information:\n");

printf("input student's num:\n");

scanf("%d",&stu1.num);

if(stu1.num!=0)

{

printf("input student's name:\n");

scanf("%s",stu1.name);

printf("input student's phone:\n");

scanf("%ld",&stu1.phone);

printf("input student's homework:\n");

scanf("%s",stu1.homework);

fprintf(fp," %d\n %s\n %ld\n %s\n",stu1.num,stu1.name,stu1.phone,stu1.homework);

}

else

{

printf("the end of the input!\n");

}

fclose(fp);

getch();

}

void output()

{

printf("stu1 num:");

printf("%d\n",stu1.num);

printf("stu1 name:");

printf("%s\n",stu1.name);

printf("stu1 phone:");

printf("%ld\n",stu1.phone);

printf("stu1 homework:");

printf("%s\n",stu1.homework);

getch();

}

void view_key()

{

printf("the key is:");

printf("%s\n",str2);

getch();

}

void change_key()

{

printf("the old key is 1 2 3 4.\n");

printf("Now please enter the new key:\n");

scanf("%s",str2);

printf("Now the new key is:\n");

printf("%s\n",str2);

getch();

}

void main()

{

laber:;

printf("please enter key:\n");

scanf("%s",str);

if(strcmp(str,str2)==0)

{

printf("please enter key again:\n");

scanf("%s",str);

if(strcmp(str,"1234")==0)

{

printf("please enter key the last time:\n");

scanf("%s",str);

if(strcmp(str,"1234")==0)

{

printf(" welcome to this system >_

printf("_________________________________________\n");

}

else goto laber;

}

else goto laber;

}

else goto laber;

toutou:;

int key;

printf(" 1--------input student information\n");

printf(" 2--------output student information\n");

printf(" 3--------view the key for tnis systerm\n");

printf(" 4--------change the key for this systerm\n");

printf(" 5--------you can leave the systerm\n");

printf(" -------------please enter your desition\n");

scanf("%d",&key);

switch(key)

{

case 1:

printf("Now,you can input one student information:\n");

input();

break;

case 2:

printf("Now,you can output student information:\n");

output();

break;

case 3:

printf("Now,you can view the key for this systerm:\n");

view_key();

break;

case 4:

printf("Now,you can change the key for this systerm:\n");

change_key();

break;

case 5:

printf("Now,you can leave the systerm!");

goto loop;

default:

printf("your decision is wrong --!\n");

}

goto toutou;

loop:;

getch();

}

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