Lecture 3: Structured Programming and Control Structures in C - Prof. Lan Xiang, Study notes of Electrical and Electronics Engineering

Download Lecture 3: Structured Programming and Control Structures in C - Prof. Lan Xiang and more Study notes Electrical and Electronics Engineering in PDF only on Docsity! 1 1 EE114: Programming Concepts for Engineers Lecture 3 2 Overview n Structured programming n Selection structure n if statement n if-else statement n switch statement 3 Structured Programming n Sequence structure n Selection structure n if statement n if-else statement n switch statement n Repetition structure n while loop n do-while loop n for loop n All these 3 structures together, selection, sequence, and repetition, are referred as control structures. All C programs could be written in terms of these three types of control structures only and we call this structured programming. 4 If statement if (expression) statement; Expression Statement True False Exit Entry if (grade < 60) printf("Sorry, you failed this class!\n"); flowchart 2 5 if (expression) { statement_1; statement_2; …… statement_n; } If statement with compound statement if (a<5) { printf("a is less than 5"); printf("Sorry, data is not correct!\n"); } 6 If-else statement if (expression) statement0; else statement1; Expression Statement0 True False Exit Entry Statement1 if (a>=0) printf(“Positive!\n”); else printf(“Negative!\n”); 7 If-else with compound statement if (expression) { statement0; statement1; } else { statement3; statement4; } if (a>=0){ printf(“Positive!\n”); x=a; } else { printf(“Negative!\n”); x=-a; } 8 Relational Operators n > if (c>b) if c is great than b n >= if (c>=b) if c is great than or equal to b n < if (c<b) if c is less than b n <= if (c<=b) if c is less than or equal to b n == if (c==b) if c is equal to b n != if (c!=b) if c is not equal to b