I wrote this program when I was a third year student in my undergraduate study to aid the structural design assignment on pratt truss of the course CE 312 Structural Analysis and Design. To understand the input and output, you can check this lecture material.
Screenshot of the program that can analyze and design purlin member. You can download the executable file from here.
Screenshot of the program that can analyze each member of the truss to find design tensile force and compressive force. You can download the executable file from here.
Screenshot of the program that can design top, bottom, vertical and diagonal chords based on their design tensile forces and compressive forces. You can download the executable file from here.