求两个字符串的最长公共字串。

/*
找出最长字符串
*/
#include <iostream.h>
#include <string.h>
#define MAX 100
void main()
{
char s1[MAX],s2[MAX],s3[MAX],s[MAX][MAX];
cout<<"input 1:";
cin>>s1;
    cout<<"input 2:";
cin>>s2;
int i1=0,i2=0,i=0;
int k1=0,k2=0,k3=0,k4=0,k22=0;
while(s1[i1]!='\0')
{
i1++;
}
while(s2[i2]!='\0')
{
i2++;
}
    cout<<i1<<"  "<<i2<<endl;
         //asasddaddfgds
         //saddfs
while(s2[k2]!='\0')
{
if(s1[k1]!='\0')
{