#include <stdio.h>

int main() {
  const char* errorMessage = "Foobar exception";
  int lineNo = 123;

  printf("%1$s at %2$d\n", errorMessage, lineNo);
  printf("(%2$d): %1$s\n", errorMessage, lineNo);

  return 0;
}

Foobar exception at 123
(123): Foobar exception