c语言练习，求解！求解求解

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);

}

#include<stdio.h>
int main()
{
    char a, b;
    scanf("%c,%c", &a, &b);
    printf("%c,%c,%c\n",a-1,a,a+1);
    printf("%o,%d,%x",b,b,b);
    return 0;
}

#include<iostream>
#include <string> 
using namespace std;

int main()
{
    string s;
    cin >> s;
    char c = s[0];
    char inf = s[2];
    cout << char(c - 1) << "," << c << "," << char(c + 1) << endl;
    int inf1 = inf;
    //建议自己写进制转换函数
    cout << std::oct << inf1 
        << ","<< std::dec << inf1 
        << ","<< std::hex << inf1 << endl;
    return 0;
}