c语言menu是什么函数,里面的menu:和menu11，memu12都是啥意思

该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

#include

#include

#include

void Encryption() ;

void Decryption() ;

main(){

menu: printf("Plase choose a option\n"); printf("1. Encryption a file\n");

printf("2. Decryption a file\n");

printf("0. Exit the application\n");

switch(getch()) {

case '1':Encryption();break;

case '2':Decryption();break;

case '0':exit(0);

}

goto menu;

}

void Encryption()

{

FILE *fp1,*fp2;

char key,ch;

char filename1[40],filename2[40];

printf(" Please input orginal filename:\n");

menu11: gets(filename1);

if((fp1=fopen(filename1,"rt"))==NULL) {

printf(" open Error,please input again!\n");

goto menu11;

}

printf(" Please input target filename:\n");

menu12: gets(filename2);

if((fp2=fopen(filename2,"wt+"))==NULL) {

printf("open Error,please input again!");

goto menu12;

}

printf(" Please input key:\n"); getche(key);

printf("\n");

while((ch=fgetc(fp1))!=EOF) {

ch=ch^key;

fputc(ch,fp2);

}

fclose(fp1);

fclose(fp2);

printf("Encryption success!\n"); }

}

void Decrytion() {

FILE *fp1,*fp2;

char key,ch;

char filename1[40],filename2[40];

printf(" Please input orginal filename:\n");

menu21: gets(filename1);

if((fp1=fopen(filename1,"rt"))==NULL) {

printf(" open Error,please input again!");

goto menu21;

}

printf(" Please input target filename:\n");

menu22: gets(filename2);

if((fp2=fopen(filename2,"wt+"))==NULL)

{

printf(" open Error,please input again!");

goto menu22;

}

printf(" Please input key:\n");

getche(key);

printf("\n");

while((ch=fgetc(fp1))!=EOF)

{

ch=ch^key;

fputc(ch,fp2);

}

fclose(fp1);

fclose(fp2);

printf("Decryption success!\n"); }