compare two columns in R

I have two columns in R, they are columns of 1's and 0's.

  Score Predict
     1       1
     1       0
     0       1
     1       1
     0       1
     1       0
     1       1
     1       1
     1       1
     0       1
     0       0
     0       0
     0       0
     1       1
     1       1
     1       1

I need to write a function that compares each column and gets an average of how many times the predicted column is the same as the score column. This shouldn't be too difficult but I am new with 'R' coding so any help is greatly appreciated. Thanks!