初学C++的代码，请大家指点里面的不足之处，谢谢了 ！
#include <iostream>
#include <string>
using namespace std;
int i=1;
double d = 11.12;
float f = 123.1;
char c = 'a';
string s = "leelnxxiang";
//long l = 123.2;
//short sh = 123123.123;
bool boo = 1;
void for_dir()
{
for(int i=0;i<100;i++)
{
cout << i;
cout << endl;
}
}
void arrays()
{
int id[100];
for(int i=0;i<100;i++)
{
id[i] = i;
cout << "id[" << id[i] << "]";
cout << endl;
}
}
void arrays_char()
{
cout << "请输入您的名字................................";
cout << endl;
char ch[11];
string str = "" ;
for(int i=0;i<11;i++)
{
cin >> ch[i];
str += ch[i];
}
cout <<"您输入的是: " << str;
}
void while_dir()
{
int x=1;
while(true)
{
cout << endl;
cout << "while ing ............" << x;
x++;
if(x == 33)
{
return;
}
}
}
void do_dir()
{
int x = 1;
do
{
cout << endl;
cout << "do while ing ............" << x;
x++;
if(x == 33)
{
return;
}
}
while(true);
}
void exit_exit()
{
cout << "退出程序请输入 'exit' ...........";
cout << endl;
string s = "";
cin >> s;
if(s == "exit")
{
cout << "保存退出程序成功!";
exit(0);
}
else
{
cout << "输入错误，程序将不保存运行";
}
}
void display()
{
cout << i;cout << endl;
cout << d;cout << endl;
cout << f;cout << endl;
cout << c;cout << endl;
cout << s;cout << endl;
//cout << l;cout << endl;
//cout << sh;cout << endl;
cout << boo;cout << endl;
}
void Cf()
{
for(int i=1;i<10;i++)
{
for(int j=1;i>=j;j++)
{
cout << i << "*" << j << "=" << i*j << " ";
}
cout << endl;
}
}
int main()
{
cout << "hello world";
cout << endl;
cout << "for .....................";
cout <<endl;
for_dir();
cout << endl;
cout << "while ...................";
while_dir();
cout << endl;
cout << "do ..................................";
do_dir();
cout << endl;
printf("显示乘法口诀..................");
cout << endl;
Cf();
printf("显示数据类型..................");
cout << endl;
display();
cout << endl;
arrays();
arrays_char();
cout << endl;
exit_exit();
}
问题点数：20、回复次数：9Top
1 楼racewind（）回复于 2006-07-03 11:46:51 得分 0
对了，C++里有没有long和short的类型？为什么我用++vdev-c++编译器有时候会编译出long和short的错误那？Top
2 楼rollor_phoe（柔枫）回复于 2006-07-03 12:04:53 得分 0
void arrays_char()
{
cout << "请输入您的名字................................";
cout << endl;
char ch[11];
string str = "" ;
for(int i=0;i<11;i++)
{
cin >> ch[i];
str += ch[i];
}
cout <<"您输入的是: " << str;
--------------------------------------------
这个函数改成：
void arrays_char()
{
cout << "请输入您的名字................................";
cout << endl;
string str = "" ;
getline(cin,str);//这样可以输入空格，它是接改一行数据，以换行符分隔
cout <<"您输入的是: " << str;
---------------------------------------------------
C++中有long和short类型。
Top
3 楼Veiz（理论上存在）回复于 2006-07-03 12:25:36 得分 0
不要用 float 这种数据类型, 就当它不存在行了。Top
4 楼Veiz（理论上存在）回复于 2006-07-03 12:47:40 得分 0
string s = "leelnxxiang"; 改为 const string s = "leelnxxiang"; 其他类似
能const 就尽量 const
少用全局变量。注意缩小变量作用域。
没有必要的话不要用printf， 用cout
int id[100] = {0}; //要初始化id
char ch[11] = {0}; // 这里也要初始化
一行中不宜出现两个以上的分号, 这是程序维护的需要
多加空格是好的。
endl会清空流缓冲区，没有必要的话用 "\n" 行了
写++i, 尽量不写i++
按照单一职责原则，一个函数应只完成一项功能。Top
5 楼Veiz（理论上存在）回复于 2006-07-03 12:53:36 得分 0
dev c++ 不是编译器，
你可以输出 sizeof(short) 和sizeof(long) ，看看它们的长度Top
6 楼racewind（）回复于 2006-07-03 13:16:46 得分 0
谢谢各位大侠！我现在脑子里总是有java的印象而且很深刻，如果不是要开发基于PPC2003的东西我可能就不学c++了，呵呵Top
7 楼racewind（）回复于 2006-07-03 13:30:05 得分 0
受教，修改如下:#include <iostream>
#include <string>
#include <math.h>
using namespace std;
int i=1;
double d = 11.12;
float f = 123.1;
char c = 'a';
const string s = "leelnxxiang";
//long l = 123.2;
//short sh = 123123.123;
bool boo = 1;
static const string static_string = "javasoft";
void for_dir()
{
for(int i=0;i<100;i++)
{
cout << i;
cout << "n";
}
}
void arrays()
{
int id[100] = {0};
for(int i=0;i<100;++i)
{
id[i] = i;
cout << "id[" << id[i] << "]";
cout << "\n";
}
}
void arrays_char()
{
cout << "请输入您的名字................................";
cout << "\n";
char ch[11];
string str = "" ;
getline(cin,str);
cout <<"您输入的是: " << str;
}
void while_dir()
{
int x=1;
while(true)
{
cout << "\n";
cout << "while ing ............" << x;
x++;
if(x == 33)
{
return;
}
}
}
void do_dir()
{
int x = 1;
do
{
cout << "\n";
cout << "do while ing ............" << x;
x++;
if(x == 33)
{
return;
}
}
while(true);
}
void exit_exit()
{
cout << "退出程序请输入 'exit' ...........";
cout << "\n";
string s = "";
cin >> s;
if(s == "exit")
{
cout << "保存退出程序成功!";
exit(0);
}
else
{
cout << "输入错误，程序将不保存运行";
}
}
void display()
{
cout << i;cout << "\n";
cout << d;cout << "\n";
cout << f;cout << "\n";
cout << c;cout << "\n";
cout << s;cout << "\n";
//cout << l;cout << "\n";
//cout << sh;cout << "\n";
cout << boo;cout << "\n";
}
void Cf()
{
for(int i=1;i<10;++i)
{
for(int j=1;i>=j;j++)
{
cout << i << "*" << j << "=" << i*j << " ";
}
cout << "\n";
}
}
int main()
{
cout << "hello world";
cout << "\n";
cout << "for .....................";
cout <<endl;
for_dir();
cout << "\n";
cout << "while ...................";
while_dir();
cout << "\n";
cout << "do ..................................";
do_dir();
cout << "\n";
printf("显示乘法口诀..................");
cout << "\n";
Cf();
printf("显示数据类型..................");
cout << "\n";
display();
cout << "\n";
arrays();
arrays_char();
cout << "\n";
cout << static_string;
cout << "\n";
exit_exit();
}
Top
8 楼Veiz（理论上存在）回复于 2006-07-03 17:07:57 得分 0
cout << "abcdefg" << endl;
cout << "abcdefg\n" ;
可以连在一起写的。Top
9 楼racewind（）回复于 2006-07-03 17:15:52 得分 0
哦，知道了，语法和java差好多来，呵呵Top
