Functia strcspn !

#include <iostream>
#include<string.h>
using namespace std;
int main()
{
 int a;
 char s1[100],s2[100];
cout<<"tasteaza o fraza: ";
cin.get(s1,100);
cin.get();
cout<<"tasteaza o fraza: ";
cin.get(s2,100);
cin.get();
 a=strcspn(s1,s2); //returneaza numarul caracterelor din s1 si nu sunt in s2
cout<<a;
 return 0;
}