This paper begins with introducing the basic idea of program debugging in UNIX system, then analyses UNIX system s sourcelevel debugger in details and gives a clear explanation of the major problem in designing a source-level debugger.

The Discussion about Calculating X-ray Bragg's Angle by Using C-Language;

Playfair Algorism and its C-language Simulative Fulfillment;

An Innovative Exploration into the Course "the C-language Programming Design";

Analysis and Defense of the C language Program Traps;

Fostering Students Interest in Learning C Language;