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# Basic programs of C++
- URL: https://developerinsider.co/basic-programs-of-cpp/
- Published: 2016-06-04T14:11:00.000Z
- Updated: 2018-03-29T17:01:15.000Z
- Author: Anit Kumar
- Tags: Primary, C++, Example

#### Write a program in C++ to print a massage on output screen.

```
#include<iostream>
using namespace std;
int main()
{
     cout<<"Hello world";
     return 0;
}

```

**Output:**

```
Hello world

```

---

#### Write a program in C++ to print an integer value.

```
#include<iostream>
using namespace std;
int main()
{
     int a;
     cout<<"Enter integer\n";
     cin>>a;
     cout<<"Integer is "<<a;
     return 0;
}

```

**Output:**

```
Enter integer
10
Integer is 10

```

---

#### Write a program in C++ to addition of two number.

```
#include<iostream>
using namespace std;
int main()
{
    int a,b,sum;
    cout<<"Enter the 1st number\n";
    cin>>a;
    cout<<"Enter the 2nd number\n";
    cin>>b;
    sum=a+b;
    cout<<"Sum of two number "<<sum;
    return 0;
}

```

**Output:**

```
Enter the 1st number
10
Enter the 2nd number
20
Sum of two number 30

```

---

#### Write a program in C++ to subtraction of two number.

```
#include<iostream>
using namespace std;
int main()
{
    int a,b,sub;
    cout<<"Enter the 1st number\n";
    cin>>a;
    cout<<"Enter the 2nd number\n";
    cin>>b;
    sub=a-b;
    cout<<"Subtraction of two number "<<sub;
    return 0;
}

```

**Output:**

```
Enter the 1st number
10
Enter the 2nd number
20
Subtraction of two number -10

```

---

#### Write a program in C++ to multiplication of two number.

```
#include<iostream>
using namespace std;
int main()
{
    int a,b,mul;
    cout<<"Enter the 1st number\n";
    cin>>a;
    cout<<"Enter the 2nd number\n";
    cin>>b;
    mul=a*b;
    cout<<"Multiplication of two number "<<mul;
    return 0;
}

```

**Output:**

```
Enter the 1st number
10
Enter the 2nd number
20
Multiplication of two number 200

```

---

#### Write a program in C++ to Division of two number.

```
#include<iostream>
using namespace std;
int main()
{
    int a,b,div;
    cout<<"Enter the 1st number\n";
    cin>>a;
    cout<<"Enter the 2nd number\n";
    cin>>b;
    div=a/b;
    cout<<"Division of two number "<<div;
    return 0;
}

```

**Output:**

```
Enter the 1st number
20
Enter the 2nd number
10
Sum of two number 2

```

#### Write a program in C++ to swap two number with the help of third variable.

```
#include<iostream>
using namespace std;
int main()
{
int a,b,c;
cout<<"Enter the first number\t";
cin>>a;
cout<<"\nEnter the second number\t";
cin>>b;
c=a;
a=b;
b=c;
cout<<"First number is\t"<<a;
cout<<"\nSecond number is\t<<b;
return 0;
}

```

**Output:**

```
Enter the first number    12
Enter the second number    13
First number is    13
Second number is    12

```

#### Write a program in C++ to swap two number without the help of third variable.

```
#include<iostream>
using namespace std;
int main()
{
int a,b;
cout<<"Enter the first number\t";
cin>>a;
cout<<"\nEnter the second number\t";
cin>>b;
a=a+b;
b=a-b;
a=a-b;
cout<<"First number is\t"<<a;
cout<<"\nSecond number is\t<<b;
return 0;
}

```

**Output:**

```
Enter the first number    12
Enter the second number    13
First number is    13
Second number is    12

```

#### Write a program in C++ to find the greatest number in two numbers with the help of if/else.

```
#include<iostream>
using namespace std;
int main()
{
int a,b;
cout<<"Enter the first number\t";
cin>>a;
cout<<"Enter the second number\t";
cin>>b;
if(a>b)
cout<<"Greatest number is\t"<<a;
else
cout<<"Greatest number is\t"<<b;
return 0;
}

```

**Output:**

```
Enter the first number    12
Enter the second number    13
Greatest number is    13

```