What is program logic?

Snarled program logic is unstructured logic, also known as "spaghetti" logic. Compiled machine code is the ultimate example of snarled program logic. Although spaghetti code is more compact and efficient than structured code, it is extremely difficult to both comprehend and maintain. Hence we use structured programming languages to provide a high level of abstraction between the logic of the programmer and the snarled logic of the machine-dependant code.