0
#include
#include
void main()
{
char reg[20];
int q[20][3],i,j,len,a,b;
clrscr();
for(a=0;a<20;a++)
{
for(b=0;b<3;b++)
{
q[a][b]=0;
}
}
printf("Regular expression: \n");
scanf("%s",reg);
len=strlen(reg);
i=0;
j=1;
while(i { if(reg[i]=='a'&®[i+1]!='/'&®[i+1]!='*') { q[j][0]=j+1; j++; } if(reg[i]=='b'&®[i+1]!='/'&®[i+1]!='*') { q[j][1]=j+1; j++; } if(reg[i]=='e'&®[i+1]!='/'&®[i+1]!='*') { q[j][2]=j+1; j++; } if(reg[i]=='a'&®[i+1]=='/'&®[i+2]=='b') { q[j][2]=((j+1)*10)+(j+3); j++; q[j][0]=j+1; j++; q[j][2]=j+3; j++; q[j][1]=j+1; j++; q[j][2]=j+1; j++; i=i+2; } if(reg[i]=='b'&®[i+1]=='/'&®[i+2]=='a') { q[j][2]=((j+1)*10)+(j+3); j++; q[j][1]=j+1; j++; q[j][2]=j+3; j++; q[j][0]=j+1; j++; q[j][2]=j+1; j++; i=i+2; } if(reg[i]=='a'&®[i+1]=='*') { q[j][2]=((j+1)*10)+(j+3); j++; q[j][0]=j+1; j++; q[j][2]=((j+1)*10)+(j-1); j++; } if(reg[i]=='b'&®[i+1]=='*') { q[j][2]=((j+1)*10)+(j+3); j++; q[j][1]=j+1; j++; q[j][2]=((j+1)*10)+(j-1); j++; } if(reg[i]==')'&®[i+1]=='*') { q[0][2]=((j+1)*10)+1; q[j][2]=((j+1)*10)+1; j++; } i++; } printf("Transition function \n"); for(i=0;i<=j;i++) { if(q[i][0]!=0) printf("\n q[%d,a]-->%d",i,q[i][0]); if(q[i][1]!=0) printf("\n q[%d,b]-->%d",i,q[i][1]); if(q[i][2]!=0) { if(q[i][2]<10) printf("\n q[%d,e]-->%d",i,q[i][2]); else printf("\n q[%d,e]-->%d & %d",i,q[i][2]/10,q[i][2]%10); } } getch(); }
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