Fix build with STLPort from NDK r8d

samples/cpp/bagofwords_classification.cpp

@@ -1453,7 +1453,7 @@ void VocData::readClassifierGroundTruth(const string& filename, vector<string>&
 
     string line;
     string image;
-    int obj_present;
+    int obj_present = 0;
     while (!gtfile.eof())
     {
         std::getline(gtfile,line);
@@ -1826,7 +1826,7 @@ void VocData::readFileToString(const string filename, string& file_contents)
 
 int VocData::stringToInteger(const string input_str)
 {
-    int result;
+    int result = 0;
 
     stringstream ss(input_str);
     if ((ss >> result).fail())

samples/cpp/calibration.cpp

@@ -2,6 +2,8 @@
 #include "opencv2/imgproc/imgproc.hpp"
 #include "opencv2/calib3d/calib3d.hpp"
 #include "opencv2/highgui/highgui.hpp"
+
+#include <cctype>
 #include <stdio.h>
 #include <string.h>
 #include <time.h>

samples/cpp/point_cloud.cpp

@@ -1,7 +1,9 @@
+#include <cctype>
 #include <cstring>
 #include <cmath>
 #include <iostream>
 #include <sstream>
+
 #include "opencv2/core/core.hpp"
 #include "opencv2/core/opengl_interop.hpp"
 #include "opencv2/highgui/highgui.hpp"

samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp

@@ -45,11 +45,11 @@ int main( int argc, char* argv[])
         return -1;
     }
 
-    int divideWith; // convert our input string to number - C++ style
+    int divideWith = 0; // convert our input string to number - C++ style
     stringstream s;
     s << argv[2];
     s >> divideWith;
-    if (!s)
+    if (!s || !divideWith)
     {
         cout << "Invalid number entered for dividing. " << endl;
         return -1;

samples/cpp/videostab.cpp

@@ -32,7 +32,7 @@ public:
         ifstream f(path.c_str());
         if (!f.is_open())
             throw runtime_error("can't open motions file: " + path);
-        int size; f >> size;
+        int size = 0; f >> size;
         motions_.resize(size);
         for (int i = 0; i < size; ++i)
         {