4c

int main()
{
    char a[40];
    int b,c;
    b='a'-'A';
    c=0;
    cout << "vvedite stroku: ";
    cin.getline(a,40);
    while (a[c]!='\0')
    {
        if (a[c]>='a' && a[c]<='z')
        {
            a[c]=a[c]-b;
            cout << a[c];
            c=c+1;
        }
        else
        {
            cout << a[c];
            c=c+1;
        }
    }
}