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哪些字符应该用于ptrdiff_t在printf？

请问C标准明确说明如何打印ptrdiff_t的printf？我还没找到任何人.

int a = 1;
int b = 2;

int* pa = &a;
int* pb = &b;

ptrdiff_t diff = b - a;

printf("diff = %?", diff); // % what?