What is wrong in the following code? if (score >= 60.0) cout = 70.0) cout = 80.0) cout = 90.0) cout

What is wrong in the following code?

if (score >= 60.0)
cout < "grade="" is="">

else if (score >= 70.0) cout < grade="" is="">

else if (score >= 80.0) cout < grade="" is="">

else if (score >= 90.0) cout < "grade="" is="">

else
cout < "grade="" is="">