Added startsWithDouble() method on ZString.

ZString.cpp

@@ -267,6 +267,15 @@ namespace coreutils {
       return strncmp(cursor, value, strlen(value)) == 0;
    }
 
+   bool ZString::startsWithDouble() {
+      push();
+      char *tempc = cursor;
+      double temp = strtod(cursor, &cursor);
+      int diff = cursor - tempc;
+      pop();
+      return diff != 0;
+   }
+
    int ZString::compare(ZString zstring) {
       char *end1 = data + length;
       char *end2 = zstring.getData() + zstring.getLength();

ZString.h

@@ -252,6 +252,12 @@ namespace coreutils {
       ///
       ///
 
+      bool startsWithDouble();
+      
+      ///
+      /// 
+      ///
+
       int compare(ZString zstring);
       
       ///
@@ -393,8 +399,16 @@ namespace coreutils {
       
       bool ifCRLF();
 
+      ///
+      ///
+      ///
+      
       void nextChar();
 
+      ///
+      ///
+      ///
+
       bool boolValue();
       
     protected:

testing/zstring_test.cpp

@@ -82,4 +82,9 @@ int main(int argc, char **argv) {
    coreutils::ZString test13("12");
    std::cout << (test12 < test13) << ":" << (test13 < test12) << std::endl;   
 
+   coreutils::ZString test14("25.5");
+   coreutils::ZString test15("xyx");
+   std::cout << test14.startsWithDouble() << ":" << test15.startsWithDouble() << std::endl;
+   
+   
 }