第3周 运算的流程控制

一、程序流程控制

二、for语句

#include<iostream>
#include<stdio.h>
#include<cmath> 
using namespace std;
int main()
{
	int sum=0,i,n;
	cin>>n;
	for(i=1;i<=n;i++)
	    sum=sum+i;
	cout<<sum<<endl;
	return 0;
}

　

#include<iostream>
#include<stdio.h>
#include<cmath> 
using namespace std;
int main()
{
	int n=9,i,j;
	for(i=1;i<=n;i++)
	{
		for(j=1;j<=i;j++)
		{
			cout<<j<<"*"<<i<<"="<<j*i<<"\t";
		}
		cout<<endl;
	}
	return 0;
}

三、一维数组

#include<iostream>
#include<stdio.h>
#include<cmath> 
using namespace std;
int main()
{
	char str[10];
	int i=0;
	cin>>str;
	while(str[i]!='\0')
	{
		if (str[i]>=97&&str[i]<=122)
		{
	    	str[i]=str[i]-32;//ascii码转换
		}
		i=i+1;
	}
	cout<<str<<endl;
	return 0;
}

　

四、二维数组

#include<iostream>
#include<stdio.h>
#include<cmath> 
using namespace std;
int main()
{
	const int m=2,n=3;
	int a[m*n],b[m][n];
	int i,j,x=1;
	for(i=0;i<6;i++,x++)
	{
		a[i]=x;
	} 
	x=1;
	for(i=0;i<2;i++)
	{
		for(j=0;j<3;j++,x++)
		{
			b[i][j]=x;
			cout<<a[i*n+j]<<"\t"<<b[i][j]<<endl;
		}
	}
	return 0;
}

#include <iostream>
using namespace std;
int main()
{ 
    char month[12][10]={"January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November", "December"};//月份和英文对应起来
    int m;
    cin>>m;
    if(m>0&&m<13)
        cout<<month[m-1];
    else
        cout<<"The month is wrong";
    return 0;
}

　

五、结构体

 

　

　　

 

五、单步调试

设置断点----调试-------添加查看-------下一步

#include <iostream>
using namespace std;
int main()
{ 
    struct telelist/、每个结构体的具体内容
	{
	    char name[8];//名字
	    char sex;//性别
	    char num1[5];//第一个电话
	    char num2[5];//第二个电话
	}list1[3];//结构体名
    int i;
    for(i=0;i<=2;i++)//赋值
    {
        cin>>list1[i].name>>list1[i].sex>>list1[i].num1>>list1[i].num2;
    }
        
    for(i=2;i>=0;i--)//逆序输出
    {
    	cout<<list1[i].name<<"/"<<list1[i].sex<<"/"<<list1[i].num1<<"/"<<list1[i].num2<<endl;
    }
    return 0;
}

int main()
{ 
    struct data 
    {
    	int year,month,day;
    };
    struct data today={2018,3,15};
	cout<<today.year<<"-"<<today.month<<"-"<<today.day<<endl;        
    return 0;
}

#include <iostream>
using namespace std;
int main()
{ 
    struct data 
    {
    	int year,month,day;
    };
    struct data days[]={{2018,3,14},{2018,3,15}};
	cout<<days[0].day<<endl;        
    return 0;
}