MySQL Forums :: C/C++ :: Stored Procedures in c

Hi,
If it's working to call a SP using some values for sure will working also if you use
variables.But you must to handle properly this variables.
From your previous code i didn't understand where you set or expect that this variable to have also , values .
You write :

//You insert 3 values of 100
"insert into Sensor_Update values(100,100,100)"

//Here you already have a problem, because nowhere you initialized this
//user variables @a,@b,@c.So here is NULL inserted.So, if you wish
//to work your piece of code must to set some values for your variables.For //example
//SET @a=100;SET @b=50;SET @c=10;
//or
//SELECT @a:=first_field,@b:=second_field,@c:=third_field from Sensor_Update

"insert into Sensor_Update values(@a,@b,@c)"

//also here the @a,@b,@c are NULL
"CALL myprocInsert(@a,@b,@c)"

Regards,