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How to concatenate two integer arrays without using loop in C ?

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Given two arrays such that first array has enough extra space to accommodate elements of second array. How to concatenate second array to first in C without using any loop in program? Example:
Input: arr1[5] = {1, 2, 3}
       arr2[]  = {4, 5}
Output: arr1[] = {1, 2, 3, 4, 5}
We strongly recommend you to minimize your browser and try this yourself first.   Hint: We may use library functions in C. The idea is to use memcpy() or memmove() in C.
// arr1[] is of size m+n and arr2[] is of size n. This function
// appends contents of arr2[] at the end of arr1[]
void concatenate(int arr1[], int arr2[], int m, int n)
   memcpy(arr1 + m, arr2, sizeof(arr2)); 

See this for complete running code. Thanks to Utkarsh Trivedi for suggesting above solution.

Last Updated : 15 Dec, 2022
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