# Python n nn nnn nnnn – Program to Read a Number n and Compute n+nn+nnn in C++ and Python

Python n nn nnn nnnn: In the previous article, we have discussed about Program to Clear the Rightmost Set Bit of a Number in C++ and Python. Let us learn Program to Read a Number n and Compute n+nn+nnn in C++ Program and Python.

Given a number n , the task is to calculate the value of n+ nn +nnn in C++ and Python.

Examples:

Example1:

Input:

given number = 8

Output:

The value of 8 + 88 + 888 = 984

Example2:

Input:

given number = 4

Output:

Enter any random number = 4
The value of 4 + 44 + 444 = 492

Example3:

Input:

given number = 9

Output:

The value of 9 + 99 + 999 = 1107

## Program to Read a Number n and Compute n+nn+nnn in C++ and Python

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There are several ways to calculate the value of n + nn + nnn in C++ and  python some of them are:

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### Method #1:Using String Concatenation (Static Input) in Python

Approach:

• Give the input number as static.
• Convert the number to a string and save it in a different variable.
• Add the string twice to concatenate it and store it in another variable.
• Then multiply the string by three and assign the result to the third variable.
• Convert the second and third variables’ strings to integers.
• Add the values from all the integers together.
• Print the expression’s total value.
• Exit of program

Below is the implementation:

# given number numb
numb = 8
# converting the given number to string
strnum = str(numb)
# Add the string twice to concatenate it and store it in another variable.
strnum1 = strnum+strnum
# Add the string thrice  to concatenate it and store it in another variable.
strnum2 = strnum+strnum+strnum
# converting the strnum1 and strnum2 from string to integer using int() function
intnum1 = int(strnum1)
intnum2 = int(strnum2)
# Calculating the result value
resultVal = numb+intnum1+intnum2
print("The value of", strnum, "+", strnum1, "+", strnum2, "=", resultVal)


Output:

The value of 8 + 88 + 888 = 984

### Method #2:Using String Concatenation (User Input) in Python

Approach:

• Scan the given number and store it in the numb variable.
• Convert the number to a string and save it in a different variable.
• Add the string twice to concatenate it and store it in another variable.
• Add the string thrice to concatenate it and store it in another variable.
• Convert the second and third variables strings to integers.
• Add the values from all the integers together.
• Print the expression’s total value.
• Exit of program

Below is the implementation:

# Scan the give number
numb = int(input("Enter any random number = "))
# converting the given number to string
strnum = str(numb)
# Add the string twice to concatenate it and store it in another variable.
strnum1 = strnum+strnum
# Add the string thrice  to concatenate it and store it in another variable.
strnum2 = strnum+strnum+strnum
# converting the strnum1 and strnum2 from string to integer using int() function
intnum1 = int(strnum1)
intnum2 = int(strnum2)
# Calculating the result value
resultVal = numb+intnum1+intnum2
print("The value of", strnum, "+", strnum1, "+", strnum2, "=", resultVal)


Output:

Enter any random number = 4
The value of 4 + 44 + 444 = 492

### Method #3:Using String Concatenation (Static Input) in C++

Approach:

• Give the input number as static.
• Convert the number to a string  using to_string() function in C++ and save it in a different variable.
• Add the string twice to concatenate it and store it in another variable.
• Add the string thrice to concatenate it and store it in another variable.
• Convert the second and third variables strings to integers using stoi() function.
• Add the values from all the integers together.
• Print the expression’s total value.
• Exit of program

Below is the implementation:

#include <bits/stdc++.h>
using namespace std;
int main()
{
// given number numb
int numb = 9;
// converting the given number to string
string strnum = to_string(numb);

// Add the string twice to concatenate it and store it
// in another variable.
string strnum1 = strnum + strnum;
// Add the string thrice to concatenate it and store it
// in another variable.
string strnum2 = strnum + strnum + strnum;
// converting the strnum1 and strnum2 from string to
// integer using stoi() function
int intnum1 = stoi(strnum1);
int intnum2 = stoi(strnum2);
// Calculating the result value
int resultVal = numb + intnum1 + intnum2;
cout << "The value of " << strnum << " + " << strnum1
<< " + " << strnum2 << " = " << resultVal;
return 0;
}

Output:

The value of 9 + 99 + 999 = 1107