#include<stdio.h>
int main()
{
	int a;
	printf("请输入一个十六进制整数： ");
	scanf("%x",&a);
	printf(" 转换成八进制输出为： %o \n",a);   
    return 0;   
}

cc1plus: warnings being treated as errors
In function 'int main()':
Line 6: warning: format '%x' expects type 'unsigned int*', but argument 2 has type 'int*'