belajar asas c++

#include<iostream.h>
void main()
{
int a;
cout<<”Sila Masukkan Satu Nombor:”;
cin>>a;
cout<<”Nombor yang dimasukkan ialah:”<<a;
cout<<endl;
}

#include<iostream.h>                // preprocessor

void main()                        // main function

{                            // starting function body
    char name[10];
    const int Year=2009;            // define variable
    int YearBorn,Age;

cout<<"This program is use to calculate your age"<<endl;    // show output to user "This program is use to calculate your age"

cout<<"and determine whether you are qualify to vote"<<endl;    // show output to user "and determine whether you are qualify to vote"

cout<<endl<<"Please key-in your name : ";  // endl is use to show output in new line
                        // show output to user "Please key-in your name"

cin.getline(name,20);    // data will key in to variable name and cannot over than 20 letters

cout<<endl<<"YearBorn : ";        // show output to user "YearBorn"

cin>>YearBorn;                    // data will key in to variable YearBorn
   
cin.get();          // cin.get is use for variable interger and to recall back data

Age=Year-YearBorn;        // calculate age

cout<<endl<<"Hello, "<<name<<endl<<"You are "<<Age<<" years old."<<endl; // show output to user "Hello" and recall data from variable name and in new line show output "You are" and recall data from variable age and show output " years old."   

if(Age>21)                // selection structure where's age must over than 21

cout<<"You are qualify to vote!"<<endl;    // show output to user "You are qualify to vote!"

else        // selection structure else if user under 21

cout<<"Sorry, You are not qualify to vote!"<<endl;    // show output to user "Sorry, You are not qualify to vote!"

cout<<"Thank you for using this program!";        // show output to user "Thanks you for using the program!"

}                                    // ending function body

#include<iostream.h>            // preprocessor
void main()                // main function
{                      // beginning function body
int choice;                // define variable

cout<<"This program will display a help message."<<endl; // show output to user "This program will display a help message".endl is use to show output in new line.
   
cout<<endl<<"Please choose between 1-3 :"<<endl;    // show output to user Please choose between 1-3

cout<<endl<<"1. for";                    // show output to user 1. for
cout<<endl<<"2. if";                    // show output to user 2. if
cout<<endl<<"3. switch";                // show output to user 3. switch

cout<<endl<<"Please enter your choice : "; // show output to user Please enter your choice

cin>>choice;            // data will key in to variable choice
cin.get();            // cin.get is use for recall back data variable int


switch(choice)            // selection structure choice
{                  // beginning function body for selection structure
case 1:                // first choice that user choose

cout<<endl<<"for is c++ most versatile loop."<<endl;        // show output to user "for is c++ most versatile loop"

cout<<endl<<"Hope this message will help you."<<endl;    // show output to user "Hope this message will help you."

break;                // to break case 1

case 2:                // second choice that user choose

cout<<endl<<"if is c++ conditional branch statement."<<endl;    // show output to user "if is c++ conditional branch statement."

cout<<endl<<"Hope this program will help you."<<endl;            // show output to user "hope this program will help you."

break;                // to break case 2

case 3:                // third choice that user choose

cout<<endl<<"Switch is c++ multiway branch statement."<<endl;    // show output to user "Switch is c++ multiway branch statement."

cout<<endl<<"Get more help in c++ with this program."<<endl;    // show output to user "Get more help in c++ with this program."

break;                // to break case 3

default:            // others choice that user choose

cout<<endl<<"You must enter a choice between 1 to 3.\a";    // show output to user "You must enter a choice between 1 to 3.".\a is for alert .

cout<<endl;                                                                 

}                        // ending function body for selection structure

cout<<endl<<"Thank you for using this program!"<<endl;  // show output to user "Thank you for using this program"

}                            // ending function body

#include<iostream.h>            // preprocessor

int main()                        // main function
{                          // beginning function body
int nPembilang=1;            // define variable

while(nPembilang<=10)        // repetition structure and limit data is equal and not over than 10

{                        // begining function body for repetition structure
cout<<" "<<nPembilang;          // display output to user for data nPembilang
++nPembilang;            // data nPembilang will added by 1 till the limit
}                            // ending function body for repetition

return 0;                              // no returning value
}                            // ending function body

#include<iostream.h>          // preprocessor

int main()                // main function
{                    // beginnign function body
int nsisi;                // define variable

cout<<"Masukkan panjang sisi kubus : \n"<<"(Taip 0 untuk tamatkan atur cara)\n";    //display output to user "Masukkan panjang sisi kubus" and in new line display (Taip 0 untuk tamatkan atur cara). \n is use to show output in new line.

cin>>nsisi;            // data will key in to variable nsisi

while(nsisi>0)            // repetition structure where's nsisi must over than 0
{                // beginning function body for repetition structure

cout<<"Isipadu kubus adalah : "<<nsisi*nsisi*nsisi<<'\n';    // display output to user "Isipadu kubus adalah" and calculate data nsisi

cin>>nsisi;            // data will key in to variable nsisi
}                  // ending function body for repetition structure

return 0;                // no returning value
}