Join space e char with integer in code

Projects Programming
1

People, I'm back with a P10 panel and an arduino uno. When a single counter reaches 0, I display a STOP message that scrolls across the panel. But I would like to show STOP + int x which is equal to 10. So it will scroll like this on the panel:

STOP 10

Then if x is 11:

STOP 11

How should this code snippet look to do this ?

int x = 10;
if(counter == 0) {
      const char *next = "    STOP     ";
     while(*next) {
      box1.print(*next);
      next++;
      delay(120);
      }
    }
3

not sure what why you do next++ when next is a char array

what about

    int x = 10;
    char next [40];
    if(counter == 0) {
        sprintf (next, "    STOP %d", x);
4

For informed help, please read and follow the directions in the "How to get the best out of this forum" post.

5

Is better not to use the message as const and avoid pointers. Use index of char instead.

int x = 10;
char msg[50];   // Set enough length to avoid buffer overflow  
sprintf(msg ," STOP %d  ", x);

  if (counter == 0) {
      for (int n = 0; n < strlen(msg); n++) {
          box1.print(msg[n]);
          delay(120)
      }
  }

Just one more tip, is good practise to not create variables inside "if" and others conditionals.

6

I disagree. Variables should only be visible where needed.

7

Well this is a simple snipper, but with codes with many lines, if you end up adding an else stament for a new feature/improvement and "maybe" you need this variable, is a waste of time.

Unless you like to duplicate the declaration.

8

If I need a different scope, I would move the declaration.