I’m not very sure what an initializer is…
When finishing my program, I had
int main () {
But it said there could not be a bracket there. I got rid of it and it said I had to add a semicolon so then I had this: int main ();
But then it said that the parentheses had to be replaced by an initializer.
Could you share your code? Remember to wrap it in [code]...[/code] tags
When defining a function you need that bracket, the error is somewhere else. There’s likely something in the loop messing up the definition (ie missing an end bracket).
The second statement, int main (); is typically used for functions defined in another file but is used in this one.
Or it could be something right before the main function, like missing semicolon or bracket.
@josiesteen, please, include the full code of your program inside [code]...[/code] tags, so we could see it and give you useful help.
@Doctortictac @Deicer Here is my code:
#include "vex.h"
using namespace vex;
// A global instance of competition
competition Competition;
// define your global instances of motors and other devices here
/*---------------------------------------------------------------------------*/
/* Pre-Autonomous Functions */
/* */
/* You may want to perform some actions before the competition starts. */
/* Do them in the following function. You must return from this function */
/* or the autonomous and usercontrol tasks will not be started. This */
/* function is only called once after the V5 has been powered on and */
/* not every time that the robot is disabled. */
/*---------------------------------------------------------------------------*/
void pre_auton(void) {
// Initializing Robot Configuration. DO NOT REMOVE!
vexcodeInit();
// All activities that occur before the competition starts
// Example: clearing encoders, setting servo positions, ...
}
/*---------------------------------------------------------------------------*/
/* */
/* Autonomous Task */
/* */
/* This task is used to control your robot during the autonomous phase of */
/* a VEX Competition. */
/* */
/* You must modify the code to add your own robot specific commands here. */
/*---------------------------------------------------------------------------*/
void autonomous(void) {
// ..........................................................................
// Insert autonomous user code here.
// ..........................................................................
}
/*---------------------------------------------------------------------------*/
/* */
/* User Control Task */
/* */
/* This task is used to control your robot during the user control phase of */
/* a VEX Competition. */
/* */
/* You must modify the code to add your own robot specific commands here. */
/*---------------------------------------------------------------------------*/
void usercontrol(void) {
// User control code here, inside the loop
while (1) {
// This is the main execution loop for the user control program.
// Each time through the loop your program should update motor + servo
// values based on feedback from the joysticks.
// ........................................................................
// while (1){
Drivetrain.drive(forward);
if(Controller1.ButtonL1.pressing()){
;
Arm.spin(forward);
}
if(Controller1.ButtonL2.pressing()){
;
Arm.spin(reverse);
}
if(Controller1.ButtonX.pressing()){
;
Claw.spin(forward);
}
if(Controller1.ButtonY.pressing()){
;
Claw.spin(reverse);
}
// ........................................................................
wait(20, msec); // Sleep the task for a short amount of time to
// prevent wasted resources.
}
//
// Main will set up the competition functions and callbacks.
//
int main();
// Set up callbacks for autonomous and driver control periods.
Competition.autonomous(autonomous);
Competition.drivercontrol(usercontrol);
// Run the pre-autonomous function.
pre_auton();
// Prevent main from exiting with an infinite loop.
while (true) {
wait(100, msec);
}
}Your if statements don’t need semicolons (;)
In fact no loop needs semicolons.
Also please note that you are telling your drivetrain to constantly move forward.
Finally if none of the buttons for a motor are being pressed, you probably want them to stop. Just add another if for if none of them are being pressed, stop.
There are several issues that appear in your code.
First one is semicolon after main, it should be int main() {
The second is you may need to tell motors desired spin velocity.
Third, you need to tell motors to stop when no buttons is pressed.
else if( Controller1.ButtonL1.pressing() )
{
Arm.spin(forward, 70, pct); // at 70%
}
else if( Controller1.ButtonL2.pressing() )
{
Arm.spin(reverse, 50, pct); // at 50%
}
else
{
Arm.stop(hold); // hold arm in place
}
motor.stop() reference: https://api.vexcode.cloud/v5/html/classvex_1_1motor.html#a7bdf7f0e0f5db59e42235d76e626d129
For velocity every motor is preset to (I think) 40% but it can be changed with motor.velocity, so you don’t necessarily need to list power jn each spin statement
This is a very good observation that you could independently set motor velocity without starting the motor. I didn’t know it was preset to 40%.
I was trying to show that motor stop command was missing and that you don’t have to use same motor power when arm goes up and down. Gravity assists motor going down and motor has to overcome gravity going up.
If rubber bands are not assisting the arm to stay in high position, then you need to hold it when no buttons is pressed.