Push down automata

[Dain1234]

[Dain1234]

include

include

char stack[20]; int top; void push() { top=top+1; stack[top]='0'; stack[top+1]='\0'; } int pop() { if(top<1) return(0); else { stack[top]='\0'; top=top-1; return(1); } } void main() { int m,i,j,k,l,a,len; char input[20],rem_input[20]; printf("Simulation of Pushdown Automata for 0n1n\n"); printf("Enter a string : "); scanf("%s",input); l=strlen(input); j=0;stack[0]='Z';top=0; printf("Stack\tInput\n"); printf("%s\t%s\n",stack,input); while(1) { len=strlen(input); while(len>0) { if(input[0]=='0') { push(); m=0; for(k=1;k<len;k++) { rem_input[m]=input[k]; m=m+1; } rem_input[m]='\0'; strcpy(input,rem_input); printf("%s\t%s\n",stack,input); } if(input[0]=='1') { a=pop(); if(a==0) { printf("String not accepted"); goto b; } else { m=0; for(k=1;k<len;k++) { rem_input[m]=input[k]; m=m+1; } rem_input[m]='\0'; strcpy(input,rem_input); printf("%s\t%s\n",stack,input); } } break; } j=j+1; if(j==(l)) { break; } } if(top>=1) { printf("String not accepted"); } else { printf("String accepted"); } b: printf("............."); }