#include <iostream>
using namespace std;

int main()
{
    int x;
    char y;
    x = -1;
    y = -2;
    cout << "x is "<< x <<" and y is " << y << endl;
}

Output:

x is -1 and y is -2.

3. We can’t use any modifiers in float data type. If programmer tries to use it ,the compiler automatically gives compile time error.

include <iostream>
using namespace std;
int main()
{
    signed float a;
    short float b;
    return (0);
}
Output:

[Error] both 'signed' and 'float' in declaration specifiers
[Error] both 'short' and 'float' in declaration specifiers

4. Only long modifier is allowed in double data types. We cant use any other specifier with double data type. If we try any other specifier, compiler will give compile time error. 

#include <iostream>
using namespace std;
int main()
{
    long double a;
    return (0);
}

#include <iostream>
using namespace std;
int main()
{
    short double a;
    signed double b;
    return (0);
}

Output:

[Error] both 'short' and 'double' in declaration specifiers
[Error] both 'signed' and 'double' in declaration specifiers