解析：

输入一个数n，输出 I'm n years old。

参考答案：

#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    cout << "I'm " << n << " years old.";
    return 0;
}

易错点：

1. n的左右两边都有空格，体现在代码中，就是输出的两句话中，第一句末尾和第二句开头，都有一个空格。
2. 输出的语句要注意开头字母i要大写，末尾有个英文的标点符号。

几岁啦

思路：

初始化设置→定义主函数→输入→拼接并输出

代码：

#include <iostream>
using namespace std;//初始设置
int main()//定义主函数
{
    int a;
    cin >> a;//输入
    cout << "I'm " << a << " years old.";//拼接并输出
    return 0;
}

这是一个题解

#include <bits/stdc++.h> //hetao4040809
using namespace std;
int main()
{
    int n;
    cin>>n;
    cout<<"I'm "<<n<<" years old.";
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin>>a;
    cout<<"I'm "<<a<<" years old.";
    return 0;
}666

《阴郁砖加核墓》

代码来辣

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    cout<<"I'm "<<a<<" years old.";
    //cout可以同时输出多个类型的数据（没想到吧
    return 0;
}

我是预言家，我知道你一定会给我点赞

这什么恰到好处的空格啊

#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    cout << "I'm " << n << " years old.";
    return 0;
}

#输入禾木的年龄
age=input()
#输出禾木的年龄
print ("I'm {} years old.".format(age))

《下划线之歌》

#include<iostream>
using namespace std;
#define __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ int
#define _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ cin
#define ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ cout
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ main()
{
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________;
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________>>___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________;
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________<<"I'm "<<___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________<<" years old.";
}

P0003. 几岁啦

题目描述

过年了，禾木去亲戚家拜年，亲戚总是亲切的问他：“禾木，你几岁啦？”

禾木被问的有些烦了，想编写一个程序，自动回答。请你编程帮助禾木完成这个任务。

参考代码:

#include <bits/stdc++.h>
using namespace std;
long long n;
int main()
{
    cin >> n;
    cout << "I'm " << n << " years old.";
    return 0;
}

题解

懒得写注释了，自己看吧

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    cout << "I'm " << n << " years old.";
    return 0;
}

思路

输入n，输出 "I'm n years old"

转换为代码即以下

int n;
cin >> n;
cout << "I'm " << n << " years old."

#include <iostream>
using namespace std;

int main()
{   
    int n;
    cin >> n;
    cout << "I'm "<< n <<" years old.";
    return 0; 
}

几岁啦

难度：

又是有手就行

思路：

定义整数变量→输入→输出

上代码：

#include <iostream> //必备工具
using namespace std;
int main() //程序的开始
{
    int n; //定义一个整数变量n代表年龄
    cin >> n; //输入年龄赋值给n
    cout << "I'm " << n << " years old."; //输出 I'm 年龄 years old.
    return 0; //程序结束
}

#include<iostream>
using namespace std;
int main()
{
    int n;
    cin>>n;
    cout<<"I'm "<<n<<" years old.";
    return 0;
}

几岁了

题意：

输出一个数n，输出“I'm” n(变量) “years old”

思路：

初始化 → 定义变量 → 外部输入赋值给变量 → 输出“文字” + 变量 + “文字” → 结束

题解：

#include <iostream>  //导入输入输出库
using namespace std;  //使用标准名称定义
int main()  //主函数
{
    int a;  //定义变量
    cin >> a;  //外部输入赋值给变量
    cout << "I'm" << a <<  " years old.";  //输出
    return 0;  //程序结束
}

强调：注意空格！注意空格！！注意空格！！！