Lab 6 rOperators l Relational Operators l Equality Operators l Logical Operators rIf statement l One Alternative l With Compound Statement l Nested If NOTE: Be Careful Read Chapter 4(All Self-Check exercises and all remaining exercises). C KEYWORDS and format must be learned by heart

Review of Rules of Evaluating Expressions Exercise 1 : Include parentheses to show the order of performing the expressions. ra+b*c ra*b+c%d r-c%d r-a +c%d r-a /-b +c r-a/-(b+c)

Simple Conditions Exercise 2: Provide the English Meaning and Values. Given: x=-5, power=1024,y=7, MAX_POWER=1024,mor_or_dad=‘M’ SENTINEL=999 rx<=0 rx>=MAX_POWER rmor_or_dad == ‘M’ rx != SENTINEL

Operator Precedence Function calls highest ! + - & (UP) * / % + - >= == != % || = Lowest

Exercise3 (Step by Step Evaluation) rProvide the English Meaning and Values. Given :x=3.0, y=4.0, z =2.0, and flag =5 r!flag rx + y / z <= 3.5 r !flag || (y+z >= x-z) r!(flag || (y+z >= x-z)

rShort-circuit evaluation : stopping evaluation of a logical expression as soon as its value can be determined. l Exp : a ||b, a&&b rLogical Assignments : int age, char gender, int senior_citizen, in_range and is_letter, n, even l scanf (" %d ",&age); l senior_citizen=(age>=65); l ! senior_citizen; l senior_citizen && gender ==‘M’; l is_range = (n>-10 && n<10); is_letter = ( (‘A’ <= ch && ch<=‘Z’) || (‘A’ <= ch && ch<=‘Z’) ); even = (n%2 == 0) ; Short-circuit evaluation and Logical Assignments

Complementing a Condition and Morgan’s Theorem r!(item ==SENT) r!(status==‘s’ && age > 25) rMorgan’s Theorem l The complement of expr1 && expr2 as comp1 || comp2 l The complement of expr1 || expr2 is comp1 && comp2 rExercise4 :Given x=15.0 and y = 25.0, evaluate the following expressions : l x!=y l x<x l x >= y l x == y +x –y

rExercise5 : Given a =5, b=10, c=15 and flag =1. Use the short circuit evaluation : l c == a+b || !flag l a!= 7 && flag || c>=6 l !(b<= 12) && a%2 ==0 l !(a > 5 || c < a+b) l Complement each expression. l What is the value assigned to ans of type int if p=100 and q=50 ans = (p>95) +(q<95);

Programming rWrite an expression to test the following : l age is from 18 to 21 inclusive. l water is less than 1.5 and also greater than 0.1 l year is divisible by 4. l speed is not greater than 55. l y is greater than x and less than z. l w is either equal to 6 or not greater than 3. l Assign 1 to between if n is the range –k through +k l Assign 1 to uppercase if ch is uppercase letter; otherwise assign a value of 0. l Assign a value of 1 to divisor if m is divisor of n; otherwise assign it the value of 0.

If Statement rWhat do the statements display ? l If(12 <12) printf (" less" ); else printf (" not less" ); l var1= 25.12, var2= if( var1 <= var2) printf (" less or equal" ); else printf (" greater than" ); rWhat is the value assigned to x when y = 15.0 ? l x =25.0; If (y!= (x-10.0)) x=x-10.0; else x=x/2.0;

rWrite C statements : l If item is nonzero, then multiply product by item and save the result in product, otherwise skip the multiplication. In either case, print the value of product. l If x is 0, add to zero_count. If x is negative, add x to the minus_sum. If x is greater than 0, add x to plus_sum. rCompute the population growth from yesterday to today as a percentage of yesterday’s population. rTrace the following program given x =12.5, y=5.0, temp=?: if (x>y) { temp=x; x=y; y=temp;}

Exercise6 rWrite an if statement that might be used to compute and display the average of a set of n numbers whose sum is stored in variable total. This average should be only if n>0, otherwise an error message should be displayed.

Multiple-Alternative Decision rWrite a C program that shows the relationship between noise and human perceptions of noises. Loudness in Decibels (db) Perception or lower quiet intrusive annoying very annoying above 110 uncomfortable

Exercice7 rA store clerk gains a raise of 10% of his salary if all the sales he has performed exceed 30,000 DH worth of the merchandise each month, an only 5% raise if the sales are below 30,000 DH. Write a C program that shows the clerk man how to figure out what is his raise. rExplain the difference between : If( x >= 0) x = x+1 else if (x>=1) x= x+2 And If (x >= 0) x = x+1 if (x>=1) x= x+2

Exercise 8 Write a program to show the expected brightness of a standard light bulb given its wattage. Display Unknown bulb if the watts input is not in the table. Watts Brightness (in Lumens)