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<>一、c++中新的数据类型
我们先看看c的数据类型
这些就是c语言数据类型
而在c++中新增**bool（布尔类型)**其值为true或false，这种类型是c语言中没有的。
<>二、c++中的初始化方法
c语言的初始化方法c++的初始化方法
赋值初始化 int x=1024 ;赋值初始化 int x=1024;直接初始化 int x(1024);
<>三、c++中随用随定义
C语言
int main() { int x; float y; x=1; y=2.5; return 0; }
C++
int main() { int x; x=1; float y; y=2.5; return 0; }
从上面两个例子中我们可以看出，c语言中变量定义必须位于函数体的最前面,而c++所有变量随用随定义
<>四、c++的输入输出
先来看看c语言中一般的输入输出过程
而c++的输入输入过程如下：
从上面两图可以看出
c++就是把c的printf改成cout，把scanf改成cin
当然c++输入输出的代码风格也更为简单，代码如下
#include <iostream> using namespace std;//这是命名空间，下一篇文章会讲，先敲着 int main(void) {
int x,y; cin >> x>>y; cout<<x<<y<<endl;
//变量与变量之间，变量与字符之间要用<<连接,其中endl相当于\n用于回车换行 return 0; }
