算法与程序设计（Algorithm and program design）.docVIP

算法与程序设计（Algorithm and program design） Collected by oneself Mistakes are unavoidable For reference only In case of error Please correct me! Thank you Algorithm and program design Chapter 1: computers and algorithms The general process of computer problem solving: Problem analysis: design algorithm. Write program: run program debug program solve problem The difference between instructions, programs, and software: Instruction: the command that a computer performs an operation Program: an ordered collection of instructions The program is stored in the memory of the computer first The program consists of the instruction part (operation code) and the data part (address code) Software: program + related documentation Algorithms: methods and steps to solve problems Algorithm is the soul of programming Klaus Vos: algorithm + data structure = Program Algorithm characteristics: 1, poor sex 2, certainty 3, feasibility 4, there are 0 or more inputs 5, there is one or more outputs 3 descriptions of algorithms: 1, natural language 2, flow chart 3, pseudo code or programming language Flow chart of basic frame: Three modes of the algorithm (structure): Sequential patterns (sequential structures), selection patterns (branch structures), repeating patterns (cyclic structures) Loop structure: type can not execute the loop body Until type executes at least one cycle body Variable: memory cell Distinguish between variable names and variable values Variable characteristics: an assignment is to assign a cover, after the use of (take endless, squeeze out, add in) Types of variables: numeric and character (characteristic: ) The string size is the size of 9 100000 , and AbC ABC is true (true or 1) Explanation: start from the first character If it is big, it will be big Regardless of the back If same Compare second characters, and so on Assign number variables: = or . Explanation: first, the value on the right of the assignment number is calculated Assign values to variables on the left of t