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How to concatenate two integer arrays without using loop in C ?
  • Difficulty Level : Easy
  • Last Updated : 02 Jun, 2017

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?


Input: arr1[5] = {1, 2, 3}
       arr2[]  = {4, 5}
Output: arr1[] = {1, 2, 3, 4, 5}

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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.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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