poj-1028-Web-Navigation.zip_poj

#include<stdio.h> #include<string.h> struct stack{ char url[100]; }; stack forward[100]; stack backward[100]; stack current; int topf=0; int topb=0; void Newc(stack s) { int i=0; while(s.url[i]!='\0') { current.url[i]=s.url[i];i++; } current.url[i]='\0'; } void Back() { int i=0; if(topb==0)printf("Ignored\n"); else{ while(current.url[i]!='\0'){ forward[topf].url[i]=current.url[i];i++; } forward[topf].url[i]='\0'; topf++; topb--; Newc(backward[topb]); printf("%s\n",current.url); } } void Forward() { int i=0; if(topf==0)printf("Ignored\n"); else { while(current.url[i]!='\0') { backward[topb].url[i]=current.url[i];i++; } backward[topb].url[i]='\0'; topb++; topf--; Newc(forward[topf]); printf("%s\n",current.url); } } void Vist(stack s) { int i=0,j=6; topf=0; while(i<=strlen(current.url)) { backward[topb].url[i]=current.url[i++]; } topb++; i=0; while(j<=strlen(s.url)) { current.url[i++]=s.url[j++]; } printf("%s\n",current.url); } int main() { current.url[0]='h';current.url[1]='t';current.url[2]='t';current.url[3]='p'; current.url[4]=':';current.url[5]='/';current.url[6]='/';current.url[7]='w'; current.url[8]='w';current.url[9]='w';current.url[10]='.';current.url[11]='a'; current.url[12]='c';current.url[13]='m';current.url[14]='.';current.url[15]='o'; current.url[16]='r';current.url[17]='g';current.url[18]='/';current.url[19]='\0'; stack cache; while(1) { gets(cache.url); if(cache.url[0]=='Q') break; if(cache.url[0]=='V') Vist(cache); if(cache.url[0]=='B') Back(); if(cache.url[0]=='F') Forward(); } return 0; }