Adjacency Matrix

#include<iostream>
#include<cstdio>
#include<cmath>
#include<vector>
#include<list>

using namespace std;

int main()

{
    int v,a,b,k=1,i;
    int adj[100][100];
    cout<<"Input No Of Vertex: ";
    cin>>v;

    do
    {
        //cout<<"Input No Of Edges"<<endl;
        cout<<"Edge "<<k<<endl;
        cin>>a>>b;
        if(a<=v && b<=v)
        {
            adj[a][b]=1;
            adj[b][a]=1;
            k++;
        }

        else
        {
            cout<<"Invalid Input,Try Again!!"<<endl;
        }

    } while(a!=0 || b!=0);

    int j ;
    for(i=0;i<v;i++)
    {
        for(j=0;j<v;j++)
            printf("%d ",adj[i][j]);
        printf("\n");
    }

    return 0 ;
}