строки а

#include <iostream>

using namespace std;

int main()
{   int mass=100;
    char a[mass];
    int b=0;
    cout << "vvedi stroky" << endl;
    cin.getline (a,mass);
    for (int i=0;i<mass-1;i++){
        if (a[i]>='a' && a[i]<='z' && a[i+1]>'z' ||a[i]>='a' && a[i]<='z' && a[i+1]<'a' ||a[i]>='A' && a[i]<='Z' && a[i+1]>'Z' ||a[i]>='A' && a[i]<='Z' && a[i+1]<'A' ){
            b++;
        }
        if (a[i]==0){
            break;
        }
        }

    cout << b;
}