#include <iostream>
using namespace std;

int main() {
    int j = 1;
    for(int i = 1; i <= 9; i++){
        cout << i << "*" << j << "=" << i * j << " ";
        if(i < j){
            continue;
        }
        i = 0;
        j ++;
        if(j == 10)
            return 0;
        cout << endl;
    }

    return 0;
}

输出：
F:\ClionWS\Test\cmake-build-debug\Test.exe
1*1=1
1*2=2 2*2=4
1*3=3 2*3=6 3*3=9
1*4=4 2*4=8 3*4=12 4*4=16
1*5=5 2*5=10 3*5=15 4*5=20 5*5=25
1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36
1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49
1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64
1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
Process finished with exit code 0