error: invalid conversion from ‘int’ to ‘int*’ [-fpermissive]. I have provided my code below, I am new to coding so feel free to help me out;)

Question

I have provided the screenshot of the code and the error is also visible i don't understand the error and will appreciatle any kind of help.

Answer 1

You need to create a pointer to you array, and then give it to merge function. Or replace merge(*int arr1, int n1, *int arr2, int n2, *int ans) on links to array

Answer 2

merge is declared as void merge(int*, int, int*, int, int*). But in main you call it as

merge(n1, n2, arr1, arr2);

with int, int, int*, int* (5th parameter is missing). You need to allocate some memory for the parameter ans. Presumably something like

auto arrAns = new int[n1 + n2];

(don't forget to delete[] it at the end!) and pass them in the correct order:

merge(arr1, n1, arr2, n2, arrAns);

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Finally some notes:

• Why not int arrAns[n1 + n2];? Because VLAs are not part of the C++ standard
• Whenever possible use standard containers like std::vector, instead of manual memory management.