c语言练习，求解！求解求解

Question

Answer 1

示例代码如下
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#include<stdio.h>

int main(int argc, char const *argv[])
{
    char a, b;
    scanf("%c,%c", &a, &b);
    printf("%c,%c,%c\n",a-1,a,a+1);
    printf("%d,%o,%x\n",b,b,b);

}