用putchar输出单个字符

#include<iostream>// or <stdio.h>
//#include<iomanip>
using namespace std;
int main()
{
	char a,b,c;
	a='B';b='O';c='Y';
	putchar(a);putchar(b);putchar(c);putchar('\n');
	putchar(66);putchar(79);putchar(89);putchar(10);
	return 0;
}