下述程序用来输出两个字符串前7个字符中对应相等的字符及其位置号，则程序横线处应该填写的是______。#include＜stdio.h＞main(){char s1[]= chinese , s2[]= japanese ; int i;for(i=0; s1[i]!= 0 &&s2[i]!= 0 ; i++)if(s1[i]==s2[i]&&i＜7)______;}
A．putchar(s2[i]); putchar(i)
B．puts(s1[i], i)
C．printf("%c%d\n", s2[i], i)
D．printf("%c", s1[i]); printf("%d\n", i)