copy a file from one directory to another in c

Change this:

system("cp source destination");

To this:

std::string cmd = std::string("cp '") + source + "' '" + destination + "'";

And BTW, you should either return from inside the if(argc != 3) statement, or do the rest of the code inside an else statement.

Lastly, function int main(int argc, char *argv[]) requires that you return an int value.

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