NFA SIMULATION

[CHINTHATHANMAI]

[CHINTHATHANMAI]

include

include

void main() { int i,j,k,l,next_state[20],n,mat[5][5][5],flag,p; int num_states,final_state[5],num_symbols,num_final; int present_state[20],symbol[5],prev_trans,new_trans; char ch,input[20]; printf("How many states in the NFA : "); scanf("%d",&num_states); printf("How many symbols in the input alphabet : "); scanf("%d",&num_symbols); for(i=0;i<num_symbols;i++) { printf("Enter the input symbol %d : ",i+1); scanf("%d",&symbol[i]); } printf("How many final states : "); scanf("%d",&num_final); for(i=0;i<num_final;i++) { printf("Enter the final state %d : ",i+1); scanf("%d",&final_state[i]); } //Initialize all entries with -1 in Transition table for(i=0;i<4;i++) { for(j=0;j<4;j++) { for(k=0;k<4;k++) { mat[i][j][k]=-1; } } } //Get input from the user and fill the 3D transition table for(i=0;i<num_states;i++) { for(j=0;j<num_symbols;j++) { printf("How many transitions from state %d for the input %d : ",i,symbol[j]); scanf("%d",&n); for(k=0;k<n;k++) { printf("Enter the transition %d from state %d for the input %d : ",k+1,i,symbol[j]); scanf("%d",&mat[i][j][k]); } } } while(1) { printf("Enter the input string : "); scanf("%s",input); present_state[0]=0; prev_trans=1; l=strlen(input); for(i=0;i<l;i++) { int inp=(int)(input[i]-'0'); new_trans=0; for(j=0;j<prev_trans;j++) { k=0; p=present_state[j]; while(mat[p][inp][k]!=-1) { next_state[new_trans++]=mat[p][inp][k]; k++; } } for(j=0;j<new_trans;j++) { present_state[j]=next_state[j]; } prev_trans=new_trans; } flag=0; for(i=0;i<prev_trans;i++) { for(j=0;j<num_final;j++) { if(present_state[i]==final_state[j]) { flag=1; break; } } } if(flag==1) printf("Acepted\n"); else printf("Not accepted\n"); printf("Try with another input"); } }