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Remove Trailing Zeros From string in C++

  • Difficulty Level : Medium
  • Last Updated : 31 May, 2017

Given a string of digits, remove trailing zeros from it.


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Input : 00000123569
Output : 123569

Input : 000012356090
Output : 12356090

1) Count trailing zeros.
2) Use string erase function to remove characters equal to above count.

Below is C++ implementation.

// C++ program to remove trailing/preceding zeros
// from a given string
using namespace std;
string removeZero(string str)
    // Count trailing zeros
    int i = 0;
    while (str[i] == '0')
    // The erase function removes i characters
    // from given index (0 here)
    str.erase(0, i);
    return str;
// Driver code
int main()
    string str;
    str = "00000123569";
    str = removeZero(str);
    cout << str << endl;
    return 0;

Output :


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