C++

What is a valid C++ function that computes and returns the number of times the lettera' appears in a word? what is valid code to sum up all of the elements along the top row of a 3 x 3 matrix called x? (assume int x[3] [3] is declared and int sum 0 initially) int countA string word) t int num 0 for (int k 0 k word.length)-1:k++ for (int i-0;i