C++ programing

1. Introduction c++ First programming

The online compiler use in this course is GDB online.

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Our first code 

 /* Hellow world code */  
 #include <iostream>   
 using namespace std;  
 int main (){  
   cout<<"I'm Md Nakibul Islam "<<endl;  
   cout<<"I'm from Bangladesh"<<endl;  
   cout<<"Feni";  
   return 0;  
 }  

2. Data Types & Variables

Data Type	Size
int	4 bytes
float	4 bytes
double	8 bytes
char	1 byte

Class Code 

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int num = 40 , I = 70;  
   float k = 10.5 , L = 50;  
   double H = 4.2548;  
   char w = 'a';  
   string T = "My name is Nakib";  
   num = I;  
   cout<<num<<endl;  
   cout<<k<<endl;  
   cout<<L<<endl;  
   cout<<I<<endl;  
   cout<<H<<endl;  
   cout<<w<<endl;  
   cout<<T;  
   return 0;  
 }  

3. User Input & Output 

Class Code 

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   string x,k;  
   cout<<"Enter Your Name : ";  
   cin>>x;  
   cout<<"Enter your Friend Name :";  
   cin>>k;  
   cout<<"Your Name is : "<<x<<endl;  
   cout<<"your Friend Name is :"<<k;  
   return 0;  
 }  

4. If else & else if

Class Code  1 

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int x;  
   cout<<"Enter a Number : ";  
   cin>>x;  
   if(x>5){  
     cout<<"Hi";  
   }  
   else {  
     cout<<"Goodbye";  
   }  
   return 0;  
 }  

Class Code 2

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int x;  
   cout<<"Enter a Number : ";  
   cin>>x;  
   if(x>=5){  
     cout<<"Hi";  
   }  
   else {  
     cout<<"Goodbye";  
   }  
   return 0;  
 }  

 Class Code 3

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int x;  
   cout<<"Enter a Number : ";  
   cin>>x;  
   if(x%2==0){  
     cout<<"Hi";  
   }  
   else {  
     cout<<"Goodbye";  
   }  
   return 0;  
 }  

Class Code 4

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int x;  
   cout<<"Enter a Number : ";  
   cin>>x;  
   if((x%2==0) && (x%5==0)){  
     cout<<"Hi";  
   }  
   else {  
     cout<<"Goodbye";  
   }  
   return 0;  
 }  

Class Code 5

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int x;  
   cout<<"Enter a Number : ";  
   cin>>x;  
   if((x%2==0) || (x%5==0)){  
     cout<<"Hi";  
   }  
   else {  
     cout<<"Goodbye";  
   }  
   return 0;  
 }  

lass Code 6

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int x;  
   cout<<"1.you"<<endl;  
   cout<<"2.My"<<endl;  
   cout<<"3.Hello"<<endl;  
   cout<<"4.sorry"<<endl;  
   cout<<"Enter a option(1-4) : ";  
   cin>>x;  
   if(x==1){  
     cout<<"1.you";  
   }  
   else if(x==2){  
     cout<<"2.My";  
   }  
   else if(x==3){  
     cout<<"3.Hello";  
   }  
   else if(x==4){  
     cout<<"4.sorry";  
   }  
   return 0;  
 }  

5. Loop

lass Code 1

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int i;  
   for(i=0; i<5; i=i+1){  
     cout<<i<<" Hi"<<endl;  
   }  
   return 0;  
 }  

lass Code 2

 #include <iostream>   
  using namespace std;   
  int main()   
  {   
   int i;   
   for(i=5; i>0; i=i-1){   
    cout<<i<<" Hi"<<endl;   
   }   
   return 0;   
  }   

lass Code 3

 #include <iostream>   
  using namespace std;   
  int main()   
  {   
   int i=0;   
   while(i<5){   
    cout<<i<<" Hi"<<endl;   
    i=i+1;  
   }   
   return 0;   
  }   

lass Code 4

 #include <iostream>   
  using namespace std;   
  int main()   
  {   
   int i=0 , k;   
   cout<<"Enter a Number : ";  
   cin>>k;  
   while(i<k){   
    cout<<i<<" Hi"<<endl;   
    i=i+1;  
   }   
   return 0;   
  }   

6. Array

lass Code 1

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int i, x[5] = {10,20,30,40,50};  
   for(i=0; i<5; i=i+1){  
   cout<<x[i]<<endl; //i=0,1,2,3,4  
   }  
   return 0;  
 }  

lass Code 2

 #include <iostream>  
 using namespace std;  
 int main()  
 {  
   int i, x[5] = {10,20,30,40,50} , k[5] = {1,2,3,4,5} , l[5]={0};  
   for(i=0; i<5; i=i+1){  
   l[i] = x[i] + k[i];   
   cout<<" "<<l[i];  
   }  
   return 0;  

lass Code 3

 #include <iostream>  
 using namespace std;  
 int main(){  
   int x[3][2]={{10,20},{30,40},{50,60}} , i ,j;  
   for(i=0; i<3; i=i+1){  //i for row and j for clom // i=0,1,2,3  
     for(j=0; j<2; j=j+1){ // j=0,1,2,0,1,2,0,1,2  
       cout<<" "<<x[i][j];   
     }  
     cout<<endl;  
   }  
   return 0;  
 }  
 }  

7. Libray Function

lass Code 

 #include <iostream>  
 #include <stdlib.h>  
 #include <time.h>  
 using namespace std;  
 int main()  
 {  
   int x;  
   srand(time(0));  
   x = rand()%10+1;  
   cout<<x;  
   return 0;  
 }