How to perform a sum of an int array

Question

Given an array A of 10 ints  initialize a local variable called sum and use a loop to find the sum of all numbers in the array A   This was my answer that I submitted   sum   0  while  A   lt  10       sum   sum    A      I didn t get any points on this question  What did I do wrong

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int sum   0  for int i   0  i  lt  A length  i       sum    A i

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Here is an efficient way to solve this question using For loops in Java   public static void main String   args         int    numbers     1  2  3  4        int size   numbers length       int sum   0      for  int i   0  i  lt  size  i              sum    numbers i              System out println sum

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Your syntax and logic are incorrect in a number of ways  You need to create an index variable and use it to access the array s elements  like so   int i   0            Create a separate integer to serve as your array indexer  while i  lt  10         The indexer needs to be less than 10  not A itself     sum    A i        either sum   sum       or sum         but not both    i                 You need to increment the index at the end of the loop      The above example uses a while loop  since that s the approach you took  A more appropriate construct would be a for loop  as in Bogdan s answer

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int sum 0  for int i A    sum  i

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Once java-8 is out  March 2014  you ll be able to use streams   int sum   IntStream of a  sum      or even  int sum   IntStream of a  parallel   sum

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When you declare a variable  you need to declare its type - in this case  int   Also you ve put a random comma in the while loop   It probably worth looking up the syntax for Java and consider using a IDE that picks up on these kind of mistakes   You probably want something like this   int    numbers     1  2  3  4  5  6  7  8  9   10    int sum   0  for int i   0  i  lt  numbers length  i         sum    numbers i     System out println  The sum is      sum

[java] How to perform a sum of an int[] array

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