get int input for a
get int input for b
get string input for operator
if a is not int or b is not int throw exception and print error
if operator is not * / // or % throw exception and print error
if operator is * do multiplication of a and b and make answer c
else if operator is / do division of a and b and make answer c
else if operator is // do floor division of a and b and make answer c
else if operator is % do floor modulo of a and b and make answer c
print c