如何在函数中使用scanf？

Question

void mscanf(char *format, ...)
{
  scanf(format);
}
int main()
{
  int n1, n2;
  mscanf("%d%d", &n1, &n2);
  printf("%d,%d\n", n1, n2);
  return 0;
}

what's wrong with this.? How could I use scanf in a function just like this? thanks.

Answer 1

Instead of your scanf you want vscanf :

va_list args;
va_start(args, format);
vscanf(format, args);
va_end(args);

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When you use functions with variable arguments list you sometimes stumble on the need to pass those variable arguments . So in your example you know what you want to do, you want to "pass the '...' to the scanf". That's exactly what the vscanf , vprintf etc functions are for: they accept the '...' in the form of a va_list .