# Remove leading zeros from an array

Given an array of N numbers, the task is to remove all leading zeros from the array.

Examples:

```Input : arr[] = {0, 0, 0, 1, 2, 3}
Output : 1 2 3

Input : arr[] = {0, 0, 0, 1, 0, 2, 3}
Output : 1 0 2 3
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: Mark the first non-zero number’s index in the given array. Store the numbers from that index to the end in a different array. Print the array once all numbers have been stored in a different container.

Below is the implementation of the above approach:

## C++

 `// C++ program to print the array ` `// removing the leading zeros ` `#include ` `using` `namespace` `std; ` ` `  `// Function to print the array by ` `// removing leading zeros ` `void` `removeZeros(``int` `a[], ``int` `n) ` `{ ` ` `  `    ``// index to store the first ` `    ``// non-zero number ` `    ``int` `ind = -1; ` ` `  `    ``// traverse in the array and find the first ` `    ``// non-zero number ` `    ``for` `(``int` `i = 0; i < n; i++) { ` `        ``if` `(a[i] != 0) { ` `            ``ind = i; ` `            ``break``; ` `        ``} ` `    ``} ` ` `  `    ``// if no non-zero number is there ` `    ``if` `(ind == -1) { ` `        ``cout << ``"Array has leading zeros only"``; ` `        ``return``; ` `    ``} ` ` `  `    ``// Create an array to store ` `    ``// numbers apart from leading zeros ` `    ``int` `b[n - ind]; ` ` `  `    ``// store the numbers removing leading zeros ` `    ``for` `(``int` `i = 0; i < n - ind; i++) ` `        ``b[i] = a[ind + i]; ` ` `  `    ``// print the array ` `    ``for` `(``int` `i = 0; i < n - ind; i++) ` `        ``cout << b[i] << ``" "``; ` `} ` ` `  `// Driver Code ` `int` `main() ` `{ ` `    ``int` `a[] = { 0, 0, 0, 1, 2, 0, 3 }; ` `    ``int` `n = ``sizeof``(a) / ``sizeof``(a[0]); ` `    ``removeZeros(a, n); ` `    ``return` `0; ` `} `

## Java

 `// Java program to print the array ` `// removing the leading zeros ` `import` `java.util.*; ` ` `  `class` `solution ` `{ ` ` `  `// Function to print the array by ` `// removing leading zeros ` `static` `void` `removeZeros(``int``[] a, ``int` `n) ` `{ ` ` `  `    ``// index to store the first ` `    ``// non-zero number ` `    ``int` `ind = -``1``; ` ` `  `    ``// traverse in the array and find the first ` `    ``// non-zero number ` `    ``for` `(``int` `i = ``0``; i < n; i++) { ` `        ``if` `(a[i] != ``0``) { ` `            ``ind = i; ` `            ``break``; ` `        ``} ` `    ``} ` ` `  `    ``// if no non-zero number is there ` `    ``if` `(ind == -``1``) { ` `        ``System.out.print(``"Array has leading zeros only"``); ` `        ``return``; ` `    ``} ` ` `  `    ``// Create an array to store ` `    ``// numbers apart from leading zeros ` `    ``int``[] b = ``new` `int``[n - ind]; ` ` `  `    ``// store the numbers removing leading zeros ` `    ``for` `(``int` `i = ``0``; i < n - ind; i++) ` `        ``b[i] = a[ind + i]; ` ` `  `    ``// print the array ` `    ``for` `(``int` `i = ``0``; i < n - ind; i++) ` `        ``System.out.print(b[i]+``" "``); ` `} ` ` `  `// Driver Code ` `public` `static` `void` `main(String args[]) ` `{ ` `    ``int``[] a = { ``0``, ``0``, ``0``, ``1``, ``2``, ``0``, ``3` `}; ` `    ``int` `n = a.length; ` `    ``removeZeros(a, n); ` `     `  `} ` `} `

## Python3

 `# Python3 program to print  ` `# the array removing  ` `# the leading zeros ` ` `  `# Function to print the  ` `# array by removing  ` `# leading zeros ` `def` `removeZeros(a, n): ` ` `  `    ``# index to store the  ` `    ``# first non-zero number ` `    ``ind ``=` `-``1``; ` ` `  `    ``# traverse in the array  ` `    ``# and find the first  ` `    ``# non-zero number ` `    ``for` `i ``in` `range``(n):  ` `        ``if` `(a[i] !``=` `0``): ` `            ``ind ``=` `i; ` `            ``break``; ` ` `  `    ``# if no non-zero ` `    ``# number is there ` `    ``if` `(ind ``=``=` `-``1``): ` `        ``print``(``"Array has leading zeros only"``); ` `        ``return``; ` ` `  `    ``# Create an array to store ` `    ``# numbers apart from leading  ` `    ``# zeros b[n - ind]; ` `    ``b``=``[``0``]``*``(n ``-` `ind); ` ` `  `    ``# store the numbers ` `    ``# removing leading zeros ` `    ``for` `i ``in` `range``(n ``-` `ind): ` `        ``b[i] ``=` `a[ind ``+` `i]; ` ` `  `    ``# print the array ` `    ``for` `i ``in` `range``(n ``-` `ind): ` `        ``print``( b[i] , end``=``" "``); ` ` `  `# Driver Code ` `a ``=` `[``0``, ``0``, ``0``, ``1``, ``2``, ``0``, ``3``]; ` `n ``=` `len``(a); ` `removeZeros(a, n); ` ` `  `# This code is contributed by mits `

## C#

 `// C# program to print the array ` `// removing the leading zeros ` `using` `System; ` ` `  `class` `solution ` `{ ` ` `  `// Function to print the array by ` `// removing leading zeros ` `static` `void` `removeZeros(``int``[] a, ``int` `n) ` `{ ` ` `  `    ``// index to store the first ` `    ``// non-zero number ` `    ``int` `ind = -1; ` ` `  `    ``// traverse in the array and find the first ` `    ``// non-zero number ` `    ``for` `(``int` `i = 0; i < n; i++) ` `    ``{ ` `        ``if` `(a[i] != 0) ` `        ``{ ` `            ``ind = i; ` `            ``break``; ` `        ``} ` `    ``} ` ` `  `    ``// if no non-zero number is there ` `    ``if` `(ind == -1) ` `    ``{ ` `        ``Console.Write(``"Array has leading zeros only"``); ` `        ``return``; ` `    ``} ` ` `  `    ``// Create an array to store ` `    ``// numbers apart from leading zeros ` `    ``int``[] b = ``new` `int``[n - ind]; ` ` `  `    ``// store the numbers removing leading zeros ` `    ``for` `(``int` `i = 0; i < n - ind; i++) ` `        ``b[i] = a[ind + i]; ` ` `  `    ``// print the array ` `    ``for` `(``int` `i = 0; i < n - ind; i++) ` `        ``Console.Write(b[i]+``" "``); ` `} ` ` `  `// Driver Code ` `public` `static` `void` `Main(String []args) ` `{ ` `    ``int``[] a = { 0, 0, 0, 1, 2, 0, 3 }; ` `    ``int` `n = a.Length; ` `    ``removeZeros(a, n); ` `} ` `} ` ` `  `// This code contributed by Rajput-Ji `

## PHP

 ` `

Output:

```1 2 0 3
```

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