C++ Lesson 4 Assignment

 

學習目標:

1.      複習所有曾學習的C++指令，包括cin, cout, if..else, for loop及變量的設定

2.      應用以上的指令。

 

參考文件: 所需語法、運算符號

 

Assignment 4-1

Calculate the area of a square

-          Let the user enter the length and then output the area of the square.

The output is as follow:

 

Assignment 4-2

Calculate the area of a circle

-          Let the user enter the radius and then output the area of the circle

 

Assignment 4-3

To judge whether a mark means passed or failed.

-          Let the user enter a mark. If the mark is larger than 60, output “passed. If not, output “failed”.

 

Assignment 4-4

To judge whether a number can be divided by 3.

-          Let the user enter a number, if the number can be divided by 3, output “ this number can be divided by 3. If not, output “this number cannot be divided by 3”.

Assignment 4-5

Enter a number and then output the same number of “*” in one line.

Assignment 4-6

Calculate the sum of all the numbers between two numbers.

-          Enter two number, output the sum of the all the numbers between these two numbers.

Assignment 4-7

Output a square made of “*”

-          Enter a number, and output a square with the same number of “* at each side.

Assignment 4-8

Output a right-angled triangle

-          Enter the base length of a right-angled triangle and then output the right-angled triangle

Assignment 4-9

Use loop function to output a 9x9 Table

Assignment 4-10

To judge a number whether it is a prime number

-          Enter a number and then judge whether it is a prime number.

Assignment 4-11

Output all the prime numbers between 1 to 100

Assignment 4-12

Let the user to enter a number, and then output all the prime numbers between 1 and the entered number.

C++ Lesson 3

 Learning Objectives

1.      Arithmetic expression

2.      Conditional statements

 

 

Exercise 3-1

#include <iostream>

using namespace std;

int main() {

  cout<<5+2;

  cout<<5-2; 

  cout<<5*2;

  cout<<5/2;

  cout<<5%2;

return 0;

}

 

<<Assignment 3-1>>

 

<<Assignment 3-2>>

 

Exercise 3-2

#include <iostream>

using namespace std;

int main() {

int a;

cout<<"enter a number smaller than 10:";

cin>>a;

if (a<=10){

    cout<<a<<" is smaller than 10";

}

return 0;

}

 

Exercise 3-3

#include <iostream>

using namespace std;

int main() {

int a;

cout<<"enter a number: ";

cin>>a;

if (a<=10){

    cout<<a<<" is smaller than 10";

}

else{

    cout<<a<<" is greater than 10";

}

return 0;

}

 

Exercise 3-4

#include <iostream>

using namespace std;

int main() {

int a;

cout<<"enter a number: ";

cin>>a;

if (a%3>0){

    cout<<a<<" cannot be divided by 3";

}

else{

    cout<<a<<" can be divided by 3";

}

 

return 0;

}

Exercise 3-5

#include <iostream>

using namespace std;

int main() {

int a;

cout<<"enter a number: ";

cin>>a;

if (a%3>0)

    cout<<a<<" cannot be divided by 3";

else

    cout<<a<<" can be divided by 3";

return 0;

}

 

<<Assignment 3-3>>

Enter a mark. If the mark is over 60, output “passed”. If the mark is below 60, output “failed”.

 

<<Assignment 3-4>>

Enter a number within 50, and distinguish whether it is a prime number(質數)

The output is as follow:

提示: 質數是除了1及自己之外，不能被其他數字整除的數字。