In while loop can the printed result increases

Question

int num=3
while (num <31){cout <<"3×1:"<<num <<endl;
num=+3}
/*
3×1:3
3×1:6
........*/
can the result out in the form of
/*
3×1:3
3×2:6
3×3:9......*/

Answer 1

int num=1;
while(num < 11) {
cout << "3x" << num << ":" << num*3 << endl;
num++;
}

Answer 2

https://code.sololearn.com/c9OWbj1z22Xk/?ref=app