Doing something n times in C with while and decrement

Here’s the standard way to do_something() n times in C:

for (int i = 0; i < n; i++) {
  do_something();
}

But if you don’t use n after the loop, and you don’t use i in the loop body, this is a simpler way:

while (n--) {
  do_something();
}

Full example:

#include <stdio.h>
int main(void) {
  int n = 3;
  while (n--) {
    printf("hey\n");
  }
  return 0;
}

which prints:

% ./a.out
hey
hey
hey

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