# Convert the number from Indian system to International system

Given an input string N consisting of numerals and separators (, ) in the Indian Numeric System, the task is to print the string after placing separators(, ) based on International Numeric System.

Examples:

Input: N = “12, 34, 56, 789”
Output: 123, 456, 789

Input: N = “90, 05, 00, 00, 000”
Output: 90, 050, 000, 000

Approach:

1. Remove all the separators (, ) from the string.
2. Iterate from the end of the string and place a separator(, ) after every third number.
3. Print the result.

Below is the implementation of the above approach:

## C++

 `// C++ Program to convert ` `// the number from Indian system ` `// to International system ` ` `  `#include ` `using` `namespace` `std; ` ` `  `// Function to convert Indian Numeric ` `// System to International Numeric System ` `string convert(string input) ` `{ ` `    ``// Length of the input string ` `    ``int` `len = input.length(); ` ` `  `    ``// Removing all the separators(, ) ` `    ``// From the input string ` `    ``for` `(``int` `i = 0; i < len; i++) { ` `        ``if` `(input[i] == ``','``) { ` `            ``input.erase(input.begin() + i); ` `            ``len--; ` `            ``i--; ` `        ``} ` `    ``} ` ` `  `    ``// Initialize output string ` `    ``string output = ``""``; ` `    ``int` `ctr = 0; ` ` `  `    ``// Process the input string ` `    ``for` `(``int` `i = len - 1; i >= 0; i--) { ` ` `  `        ``ctr++; ` `        ``output = input[i] + output; ` ` `  `        ``// Add a separator(, ) after ` `        ``// every third digit ` `        ``if` `(ctr % 3 == 0 && ctr < len) { ` `            ``output = ``','` `+ output; ` `        ``} ` `    ``} ` ` `  `    ``// Return the output string back ` `    ``// to the main function ` `    ``return` `output; ` `} ` ` `  `// Driver Code ` `int` `main() ` `{ ` `    ``string input1 = ``"12,34,56,789"``; ` `    ``string input2 = ``"90,05,00,00,000"``; ` ` `  `    ``cout << convert(input1) << endl; ` `    ``cout << convert(input2) << endl; ` `} `

Output:

```123,456,789
90,050,000,000
```

Related article: Convert the number from International system to Indian system

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