[Solved] How to perform A-B set operation in C program using builtin library

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I can guess, you forgot to initialize your m and n variables with proper values.
Add m = 10; n = 5; before calling Difference and your code will work.

I also suggest you to write more readable code: better naming for variables, use some spaces and avoid global variables.

Edit:
In C++ you can write:

#include <algorithm>
#include <iostream>
#include <iterator>
#include <set>

int main() {
    std::set<int> a = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
    std::set<int> b = { 1, 3, 5, 7, 9 };
    std::set<int> c;

    std::set_difference(a.begin(), a.end(), b.begin(), b.end(), std::inserter(c, c.begin()));

    for (const auto item : c) 
        std::cout << item << " ";

    return 0;
}

Detail information about std::set_difference can be found here

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solved How to perform A-B set operation in C program using builtin library