subarray sum prgrm added

Program's_Contributed_By_Contributors/C++_Programs/subarraysum.cpp

@@ -0,0 +1,40 @@
+
+#include <bits/stdc++.h>
+using namespace std;
+int subArraySum(int arr[], int n, int sum)
+{
+    int curr_sum, i, j;
+
+    // Pick a starting point
+    for (i = 0; i < n; i++)
+    {
+        curr_sum = arr[i];
+
+        // try all subarrays starting with 'i'
+        for (j = i + 1; j <= n; j++)
+        {
+            if (curr_sum == sum)
+            {
+                cout << "Sum found between indexes "
+                     << i << " and " << j - 1;
+                return 1;
+            }
+            if (curr_sum > sum || j == n)
+                break;
+            curr_sum = curr_sum + arr[j];
+        }
+    }
+
+    cout << "No subarray found";
+    return 0;
+}
+
+// Driver Code
+int main()
+{
+    int arr[] = {15, 2, 4, 8, 9, 5, 10, 23};
+    int n = sizeof(arr) / sizeof(arr[0]);
+    int sum = 23;
+    subArraySum(arr, n, sum);
+    return 0;
+}