JAVA Program to generate truth Tables

Active member

I just made a prog. to generate truth table for three variable expression of type a.b+b.c+c.a+a.b.c+ .....
(single variable not allowed in expression)(input should be in ablove format only)

Enter 3 Vriable expression with a,b,c
a.b+b.c+c.a
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 1
1 0 0 0
1 0 1 0
1 1 0 1
1 1 1 1

Enter 3 Vriable expression with a,b,c
a.b.c+a.b
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 1
1 1 1 1

import java.io.*;
import java.util.*;
class TruthTableMaker
{
public static void main(String args[])throws IOException
{
System.out.println("Enter 3 Vriable expression with a,b,c");
BufferedReader obj =new BufferedReader(new InputStreamReader(System.in));
String s=obj.readLine();

int a[][]=new int[8][3];

int x=0;
for(int i=0;i<8;i++)
{
a[i][2]=i%2;
x=i/2;
a[i][1]=x%2;
x=x/2;
a[i][0]=x;
}

String t="";
int o[]=new int[8];
char ch;int y=1;

for(int r=0;r<8;r++)
{
StringTokenizer st=new StringTokenizer(s,"+");

for(int k=0;k<=st.countTokens();k++)
{

t=st.nextToken();
int ab=t.length()/2;

for(int q=0;q<=ab;q++)
{
ch=t.charAt(0);

if(t.length()>1)
{t=t.substring(2);}
switch(ch)
{
case 'a': y=y*a[r][0];break;
case 'b': y=y*a[r][1];break;
case 'c': y=y*a[r][2];break;

}
}

if(y==1)
{o[r]=1;}
y=1;

}
}

for(int i=0;i<8;i++)
{
for(int j=0;j<3;j++)
{
System.out.print(a[i][j]+" ");
}
System.out.println(" "+o[i]);
}
}
}

Active member

Cool! Though I don't think its much probable. How do you post code without losing half of it?

Active member

i did't wanted to make the code too long thats why it is not much portable