c字符输出

#include<stdio.h>
int main() {
    char c1,c2;
    c1 = ;
    c2 = ;
    printf("c1 = %c,c2 = %c\n",c1,c2);// ASCII码的值在0 ～ 127之间，而c1、c2都大于127，所以没有对应的字符
    printf("c1 = %d,c2 = %d\n",c1,c2);
printf("c1 = %c,c2 = %c\n",,);//
    return ;
}

c语言字符输出结果

 c1 = a,c2 = b
 c1 = ,c2 =
 c1 = a,c2 = b