#include <bits/stdc++.h>
using namespace std;
int s(int a,int b){
if(a<=9){
if(b<=a){
cout<<a<<"*"<<b<<"="<<a*b<<" ";
s(a,b+1);
}else{
cout<<endl;
s(a+1,1);
}
}
}
int main(){
s(1,1);
return 0;
}
标签：std,九九乘法,int,namespace,using,include From： https://www.cnblogs.com/fushuxuan/p/17674576.html