Program to format a number with thousands separator in C/C++
Given an integer N, the task is to print output of the given integer in international place value format and put commas at the appropriate place, from the right.
Examples
Input: N = 47634
Output: 47, 634Input: N = 1000000
Output : 1, 000, 000
Approach: Follow the steps below to solve the problem:
- Convert the given integer N to its equivalent string.
- Iterate over the characters of the given string from the right to the left.
- After traversing every 3 characters, insert a ‘,’ separator.
Below is the implementation of the above approach:
C++
// C++ program to implement the // above approach #include <bits/stdc++.h> using namespace std; // Function to put thousands // separators in the given integer string thousandSeparator(int n) { string ans = ""; // Convert the given integer // to equivalent string string num = to_string(n); // Initialise count int count = 0; // Traverse the string in reverse for (int i = num.size() - 1; i >= 0; i--) { count++; ans.push_back(num[i]); // If three characters // are traversed if (count == 3) { ans.push_back(','); count = 0; } } // Reverse the string to get // the desired output reverse(ans.begin(), ans.end()); // If the given string is // less than 1000 if (ans.size() % 4 == 0) { // Remove ',' ans.erase(ans.begin()); } return ans; } // Driver Code int main() { int N = 47634; string s = thousandSeparator(N); cout << s << endl; } |
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Output:
47,634
Time Complexity: O(log10N)
Auxiliary Space: O(1)
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