UM程式研究日誌

//需#include iostream,iomanip
using namespace std;
int main(int argc, char** argv) {
	
	double total,sell;
	
	
	while(1)
	{
	
		cout<< "Enter sales in dollars(-1 to end):"<<endl;
		cin >>sell;
		if(sell == -1)
		break;
		total=(sell*0.09)+200;
		
		cout<<"Salary is:$"<<fixed<<setprecision(2)<<total<<endl;
	
	}
	
	return 0;
}

//需#include iostream,iomanip
using namespace std;
int main(int argc, char** argv) {
	
int hourwork;
double rate;


	while(1)
	{
		
		
		double total;	
		cout<<"Enter hours worked(-1 to end) :"<<endl;
		cin >>hourwork;
		if(hourwork==-1)
		{
			break;
		}
		cout<<"Enter hourly rate of the employee($00.00):"<<endl;
		cin >>rate;
		
		if(hourwork>40)
		{
		total = (hourwork-40)*1.5*rate+40*rate;
		cout<<"Salary is $"<<fixed<<setprecision(2)<<total<<endl;		
		}
		
		if(hourwork<=40)
		{
		total = 40*rate;
		cout<<"Salary is $"<<fixed<<setprecision(2)<<total<<endl;
		}	
	}
	
	return 0;
}

//需#include iostream,iomanip

using namespace std;
int main(int argc, char** argv) {
	int number;
	int temp;
	int n1,n2,n3,n4;
	cout<< "Enter a four-digit number :"<<endl;
	cin	>>number;
	
	n1=number/1000;
	n2=number%1000/100;
	n3=number%1000%100/10;
	n4=number%10;
	
	//每位+7
	
	n1+=7;
	n2+=7;
	n3+=7;
	n4+=7;
	
	//此數除10取餘數 為新數 
	
	if(n1>10)
	{
		n1%=10;
	}
	if(n2>10)
	{
		n2%=10;
	}
	if(n3>10)
	{
		n3%=10;
	}
	if(n4>10)
	{
		n4%=10;
	}
	
 
	
	 
	
	
	//cout<<"Encrypted number is "<<temp<<endl;
	
	
	//交換
	//1234
	//3412
	
	temp = n4*100+n1*10+n2*1;
	
	
	cout<<"Encrypted number is "<<temp<<endl;
	
	

  
  //還原
  temp=0;
  cout<<"Enter an encry number: "<<endl;
  cin>>temp;
	n3=temp/1000;
	n4=temp%1000/100;
	n1=temp%1000%100/10;
	n2=temp%10;

	if(n3-7<0)
	{
		n3 = n3+10 -7;
		
	}
	else
	{
	n3=n3-7;
	}
	
		if(n4-7<0)
	{
		n4 = n4+10 -7;
		
	}
	else
	{
	n4=n4-7;
	}
	
	
	
		if(n2-7<0)
	{
		n2 = n2+10 -7;
		
	}
	else
	{
		n2=n2-7;
	}
	
		if(n1-7<0)
	{
		n1 = n1+10 -7;
		
	}
	else
	{
		n1=n1-7;
		
	}
	cout<<"Decrypted number is "<<(n1*1000)+(n2*100)+(n3*10)+n4;
		
	return 0;
}

4.

//需#include iostream 
using namespace std;
int main(int argc, char** argv) {

	int n1,n2,n3;
	int number=100;
	
	while(number<=999)
	{
		
		n1=number/100;
		n2=number%100/10;
		n3=number%10;
			
		if(number == ((n1*n1*n1)+(n2*n2*n2)+(n3*n3*n3)))
		{
			cout<<number<<"是水仙花數"<<endl; 
			
		}
	number +=1;
	} 
	return 0;
}

第五題就不提供解法了 有興趣自己摸索吧 XD ((其實是上面在1.5小時內寫完就很頭大了

第三題我提供那個"破"解法 希望諒解 我直接把4位數的首位給砍了

以上都有成功執行，記得要include 標頭檔~  因為痞克幫會把它吃掉只好沒打出來..