Chapter 3, Problem 11CP

What is wrong in the following code?

$\begin{array}{l}\text{if}\text{(score}>=60.0)\\ \text{cont}<<"\text{Grade}\text{is D";}\\ \text{else if(score}>=70.0)\\ \text{cont}<<"\text{Grade}\text{is C";}\\ \text{else if(score}>=80.0)\\ \text{cout}<<\text{Grade}\text{is}\text{B";}\\ \text{else if (score}>=90.0)\\ \text{cout}<<\text{"Grade is A";}\\ \text{else}\\ \text{cout}<<"\text{Grade is F";}\end{array}$