How to store path names in a string in C?

argv[1]=argv[1]/filenames[j]

argv[1]=folder1
an开发者_如何学运维d filenames[2]=cool

I want to store folder1/cool in argv[1] how to proceed? I am not familiar with C.

1. you should be using "folder1" and "cool" if these are litterals
2. you should use strcat(str1, str2) if you want to mimmic str1 = str1 + str2 of e.g. Java
3. you might prefer sprintf(str1, "%s/%s","folder","cool")
4. none of the above is correct unless str1 is an array of char that has enough room to store the result (welcome to C)