Vaporeon :vaporeon: ☭

What's the stupidest programming mistake you've made?

1+
Sherclod Holmes

@vaporeon_ probably the most recent mistakes I have made were bash-related. I made some wrong assumptions regarding scope rules for variables, resulting in situations where variables in loops had values from previous iterations of the loop that I didn't expect, causing subtle bugs that took me hours to unravel

1
Vaporeon :vaporeon: ☭

@wallhackio Got an example? I am Unaware of the scope rules for Bash, actually, but I'm guessing based on your comment that they're different from the scope rules for C?

1
Sherclod Holmes

@vaporeon_ if I declare a variable in a for loop in C, it "resets" each start of the loop

That does not happen in bash, obviously, but I wrongly assumed that it did

1+
æʃliŋ, loaf of autismo
Follow

@wallhackio @vaporeon_ really C is block scoped and for loops are an implicit block. you can introduce new blocks arbitrarily wherever a statement is allowed

· · 1 · 1 · 2
Vaporeon :vaporeon: ☭

@aescling @wallhackio Yes, you can even start a block without any for or while or function definition... Should you? No. But can you? Yes:

#include <stdio.h>
int main() {
  int i = 0;
  {
    int i = 7;
    printf("i (inner): %d\n", i);
  }
  printf("i (outer): %d\n", i);
  return 0;
}
0
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