tailieunhanh - Lecture Introduction to computer and programming - Lecture No 7

The contents of this chapter include all of the following: C character set, basic constants and variables, output function – printf, input function – scanf, C instructions, integer to float conversion, hierarchy of operator, control instructions. | CSC103: Introduction to Computer and Programming Lecture No 7 Previous lecture C character set Basic constants and variables Output function – printf Input function – scanf C instructions Integer to float conversion Hierarchy of operator Control instructions Today’s Lecture outline Example programs – printf, scanf Decision control structure Relational operator in C if statement if-else statement Nested if else statement Logical operator in C Example program 1 Ahmad’s basic salary is input through the keyboard. His dearness allowance is 40% of basic salary and house rent is 20% of basic salary. Write a program to calculate his gross salary and display on screen Inputs: Processing: Output: basic salary calculate dearness allowance, house rent and gross salary display gross salary on screen Example program 2 If a five digit no is input through a key board, write a program to calculate the sum of its digits Inputs: Processing: Output: A five digit no. Separating its all digits, and then calculate sum of these digits Display the sum Decision control structure Selection/Decision Control By default execution of a program is sequential Mostly we want instructions to be executed according to situation. This issue is dealt in C programs using decision controls Selection/Decision Control The if statement The if-else statement Decision depend upon conditions The conditional operators Equality Relational Relational Operators Standard algebraic Relational Operator > = y x = y x <= y x == y x != y Meaning x is greater than y x is less than y x is greater than or equal to y x is less than or equal to y x is equal to y x is not equal to y If Statement if (this condition is true ) execute this statement ; Single-entry/single-exit Nonzero is true, zero is false If Statement Flowchart – 1 Go to program If Statement Flowchart – 2 While purchasing items, a discount of 10% is offered if the quantity is more than . | CSC103: Introduction to Computer and Programming Lecture No 7 Previous lecture C character set Basic constants and variables Output function – printf Input function – scanf C instructions Integer to float conversion Hierarchy of operator Control instructions Today’s Lecture outline Example programs – printf, scanf Decision control structure Relational operator in C if statement if-else statement Nested if else statement Logical operator in C Example program 1 Ahmad’s basic salary is input through the keyboard. His dearness allowance is 40% of basic salary and house rent is 20% of basic salary. Write a program to calculate his gross salary and display on screen Inputs: Processing: Output: basic salary calculate dearness allowance, house rent and gross salary display gross salary on screen Example program 2 If a five digit no is input through a key board, write a program to calculate the sum of its digits Inputs: Processing: Output: A five digit no. Separating its all digits, and then .