C——printf和scanf返回值问题

#include <iostream>
using namespace std;

int main(){
const char *a = "message";
int b=printf("%s", a);//返回输出的字符数，赋给b
cout << endl << "b = " << b << endl;
char i, j;
int c = scanf("%c %c",&i,&j);//返回输入的字符数，赋给c
cout << "c = " << c << endl;
return 0;
}