bool_fun.cpp

最新推荐文章于 2024-02-04 18:11:24 发布

原创最新推荐文章于 2024-02-04 18:11:24 发布 · 545 阅读

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#function #null #include #float

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name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <iostream.h>

bool func(void)
{        // Function returns a bool type
   return false;
   // return NULL; // NULL is converted to Boolean false
}

void main(void)
{
   bool val = false; // Boolean variable
   int i = 1;         // i is neither Boolean-true nor Boolean-false
   int g = 3;
   int *iptr = 0;     // null pointer
   float j = 1.01;    // j is neither Boolean-true nor Boolean-false

   if (i == true)
      cout << "True: value is 1" << endl;
   if (i == false)
      cout << "False: value is 0" << endl;
   if (g)
      cout << "g is true.";
   else
      cout << "g is false.";

   // Test on pointer
   if (*iptr == false)
      cout << "Invalid pointer." << endl;
   if (*iptr == true)
      cout << "Valid pointer." << endl;

   // To test j's truth value, cast it to bool type.
   if (bool(j) == true)
      cout << "Boolean j is true." << endl;

// Test Boolean function return value

   val = func();
   if (val == false)
      cout << "func() returned false.";
   if (val == true)
      cout << "func() returned true.";
}