How to Add Leading Zeros to a C++ String? Last Updated : 05 Mar, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In C++, a string data structure is used to store the sequence of characters. These characters can be letters, symbols, or numbers. In this article, we will learn how to add leading zeros to a string that represents some numeric data in C++. Examples: Input: str="123" N=2 Output: "00123" Explanation: 2 zeros (N) are added at the starting of given string str which is 123.Add Leading Zeros to String in C++To add leading Zeros to a string in C++, we can use the string::insert() function that can add the given characters at the given position in the string. Syntax of string::insert()stringName.insert(pos, count, chr);Here, pos: position where we want to insert the characters.count: number of times the character should be inserted.chr: character to be inserted.C++ Program to Add Leading Zeros to a C++ String C++ // C++ Program to illustrate how to add leading zeroes to a // string representing a numerica data #include <iostream> #include <string> using namespace std; int main() { // Original string string str = "123"; // Number of leading zeros to add int numZeros = 2; // Adding leading zeros to the string str.insert(0, numZeros, '0'); // Printing the string after adding leading zeros cout << "String after adding leading zeros: " << str << endl; return 0; } OutputString after adding leading zeros: 00123 Time complexity:O(M + N), where M is the number of Zeroes and N is the length of the string.Auxiliary Space: O(M) Comment More infoAdvertise with us Next Article How to Reverse a String in C++? B bhushanc2003 Follow Improve Article Tags : C++ Programs C++ cpp-strings CPP Examples Practice Tags : CPPcpp-strings Similar Reads How to Convert a std::string to char* in C++? In C++, strings are the textual data that is represented in two ways: std::string which is an object, and char* is a pointer to a character. In this article, we will learn how to convert a std::string to char* in C++. Example Input:string myString = "GeeksforGeeks";Output:char * myString = "Geeksfor 1 min read How to Reverse a String in C++? Reversing a string means replacing the first character with the last character, second character with the second last character and so on. In this article, we will learn how to reverse a string in C++.ExamplesInput: str = "Hello World"Output: dlroW olleHExplanation: The last character is replaced by 2 min read How to Convert a Single Character to String in C++? A string is a generally made up of a sequence of multiple characters. In this article, we will learn how to convert a single character to a string in C++.Example:Input: c = 'A'Output: s = "a"Explanation: Character c is converted to a string.Input: c = '#'Output: s = "#"Explanation: Character c is co 4 min read C++ Program To Add Two Binary Strings Given two binary strings, return their sum (also a binary string).Example: Input: a = "11", b = "1" Output: "100" We strongly recommend you to minimize your browser and try this yourself first The idea is to start from the last characters of two strings and compute the digit sum one by one. If the s 3 min read Convert String to Integer Vector in C++ Strings are sometimes used to represent the numerical data which needs to be converted back to integer, but sometimes we may need to convert it to vector of integers instead due to some problems such as too large integer. In this article, we will learn different way to convert a string to integer ve 2 min read How to Convert wstring to int in C++? In C++, std::wstring is a type of string where each character is of a wide character type. These types of strings can be used to store the numerical strings which can then be converted to their corresponding type. In this article, we will see how to convert a wstring to an int in C++. Input: wstr = 2 min read Like