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//! [0]

QDBusInterface remoteApp( "com.example.Calculator", "/Calculator/Operations",

                          "org.mathematics.RPNCalculator" );

remoteApp.call( "PushOperand", 2 );

remoteApp.call( "PushOperand", 2 );

remoteApp.call( "ExecuteOperation", "+" );

QDBusReply<int> reply = remoteApp.call( "PopOperand" );

if ( reply.isValid() )

    printf( "%d", reply.value() );          // prints 4

//! [0]