爲何printf("%d",printf("%d",printf("%d",43)))打印4321

先入爲主了，覺得printf是打印函數做用就是打印，可是函數就表明其可能有返回值，printf的函數返回值表示的是其返回的字符長度，因此printf("%d",printf("%d",printf("%d",43)))打印4321，

printf("%d",43)返回字符長度2

printf("%d",printf("%d",43))返回字符長度1

若是在外面再加一個printf打印即printf("%d",printf("%d",printf("%d",printf("%d",43))))打印值43211