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

Examples:

Input : 00000123569
Output : 123569

Input : 000012356090
Output : 12356090

1) Count leading zeros.
2) Use StringBuffer replace function to remove characters equal to above count.

// Java program to remove leading/preceding zeros
// from a given string
import java.util.Arrays;
import java.util.List;

/* Name of the class to remove leading/preceding zeros */
class RemoveZero
{
public static String removeZero(String str)
{
// Count leading zeros
int i = 0;
while (i < str.length() && str.charAt(i) == '0')
i++;

// Convert str into StringBuffer as Strings
// are immutable.
StringBuffer sb = new StringBuffer(str);

// The StringBuffer replace function removes
// i characters from given index (0 here)
sb.replace(0, i, "");

return sb.toString(); // return in String
}

// Driver code
public static void main (String[] args)
{
String str = "00000123569";
str = removeZero(str);
System.out.println(str);
}
}
Output:

123569
Remove leading Zeros From string in C++