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// Solidity program to  
// demonstrate the working  
// of the interface  
pragma solidity 0.4.18;  
// A simple interface  
interface InterfaceExample 
{   
    // Functions having only  
    // declaration not definition  
    function getStr() 
    public view returns(string memory);  
    function setValue(uint _num1, uint _num2) public;  
    function add() 
    public view returns(uint);  
} 
 
// Contract that implements interface  
contract thisContract is InterfaceExample 
{  
    // Private variables  
    uint private num1;  
    uint private num2;  
  
    // Function definitions of functions  
    // declared inside an interface  
    function getStr() public view returns(string memory) 
    {  
        return "GeeksForGeeks";  
    } 
    // Function to set the values  
    // of the private variables  
    function setValue(uint _num1, uint _num2) public 
    {  
        num1 = _num1;  
        num2 = _num2;  
    }  
    // Function to add 2 numbers  
    function add() public view returns(uint) 
    {  
        return num1 + num2; 
    } 
} 
contract call 
{  
    //Creating an object  
    InterfaceExample obj; 
    function call() public 
    {  
    obj = new thisContract(); 
    }  
    // Function to print string  
    // value and the sum value 
    function getValue() public returns(uint) 
    {  
        obj.getStr;  
        obj.setValue(10, 16);  
        return obj.add();  
    }  
}