#include<stdio.h>
#include<iostream>
int main(int argc,char **argv)
{
int a[5];
std::cout<<"a[1]:"<<a[1]<<"\na[2]:"<<a[2]<<"\na[3]:"<<a[3]<<"\na[4]:"<<a[4]<<std::endl;
return 0;
}这样打出来全是0啊，如何16进制输出呢？
运用iomanip库
#include <iostream>
#include <iomanip>
int main()
{
int a[5]={16,17,18,19,20};
std::cout <<std:: hex << "a[1]:" << a[1] << "\na[2]:" << a[2] << "\na[3]:" << a[3] << "\na[4]:" << a[4] << std::endl;
return 0;
}