C语言程序设计课件（英文）C program language 之1 Introduction.ppt

Chapter One Arithmetic 6 if i9，go to step3， otherwise output max which is the maximum 3: Input a new number , save it to variable x ; 1 Input a number , save it to variable max; Programming basics 5 i increment 1 , i+1?i ； 4:Compare the value of x and max; if xmax，assign x to max; otherwise keep the both value. Ex: Input 10 numbers , find the maximum 2 Set another variable i as a counter , assign 1 to i; programming design Program modules: identify the program’s processing steps. Flow chart（流程图） Pseudocode(伪代码) Computer language Plan a solution Using structured programming techniques: Programming basics Start/ End Input/Output Test Execute Flow line Connection Self review The logic structure controls the logical sequence in which computer program instructions are executed. In the sequence structure, one program statement follows another. Programming basics Three basic structures are used to form the logic of a program: sequence(顺序), selection（选择） and loop（循环）. Key : sequence selection loop A selection structure tells the program which action to take, based on certain condition. When the condition is evaluated, its result is either true or false. The if-then-else structure and the case structure are two common types of selection structures. Programming basics Self review The loop structure is used when one or more actions are to be performed repeatedly as long as a certain condition is met. There are two forms of the loop structure Programming basics Self review A B condition A B Y N condition A Y N condition A Y N Programming basics Self review * LOGO Introduction Contents What is C program language 1 Characteristics of C langugae 2 How does a C program work 3 What a C program can do 4 C Program Sturcture 5 How to use Turbo C 6 Programming basics 7 Sumary 8 document data program Computer software What is C program Language What is computer-system What is software What is program What is language C is a general-purpose