LAB MODULE 2 PROGRAM CONTROL STRUCTURE: SELECTION

Transcription

1 LAB MODULE 2 LAB MODULE 2 PROGRAM CONTROL STRUCTURE: SELECTION Schl f Cmputer and Cmmunicatin Engineering Universiti Malaysia Perlis

2 Objectives: 1 Students will be able t frm apprpriate cnditin expressins 2 Students will be able t apply selective cntrl statements in C, namely if, if and switchcase 3 Students will be able t evaluate the mst suitable selectin statements fr use in different scenaris Selectins in C Selectin statements are used t evaluate expressin and direct the executin f the prgram, depending n the result f the evaluatin Used t cntrl the flw f a prgram Als called as decisin r branches Branches are cnditins r chices used t enable selectin f prgram flw Types f selectin and its syntax One-way selectin = if if (<cnditin expressin>) Tw-way selectin = if if (<cnditin expressin>) Multi-selectin if (<cnditin 1>) <statement 1>; if (<cnditin 2>) <statement 2>; if (<cnditin 3>) <statement 3>; <statement n>; Nested if if (<cnditin expressin>) if (<cnditin 2>) if (<cnditin 3>) Switchcase switch (expressin) case value1: statements1; break; case value2: statements2; break; case valuen: statementsn; break; default: statements; LAB MODULE 2 1

3 TASKS 1 Write the fllwing prgram in C editr #include <stdih> int main() int mnth; flat bnus = 0, salary = 0; printf ("Enter mnth ( 1-12 ): "); scanf ("%d", &mnth); printf ("\nenter mnthly salary (RM):"); scanf ("%f", &salary); //******* Start : 'if' statements ***************** if (mnth < 6) bnus = mnth/120 * salary; printf ("\\nnfirst half f year"); bnus = mnth/120 * (salary + 200); printf ("\n\nsecnd half f year"); //****** End : 'if' statements ********************* printf ("\n\n"); printf ("Yu get RM%f as bnus", bnus); return 0; a Run the prgram abve using inputs (test data) as belw Nte dwn the actual utput and determine whether it is the same as the expected utput N Inputs Expected utput Actual utput Same? ( r X) 1 mnth = mnth = mnth = 8 salary = mnth = 5 salary = mnth = 30 Nt allwed since mnth is mre than 12 b Hw wuld yu mdify the prgram s that the actual utput is the same as the expected ne? Yu may write the mdificatin in the cde abve (Hints: Mdify the display frmat, and als add anther 'if' cnditin) 2 Write apprpriate C statement(s) t accmplish the fllwing tasks: a If A is mre than B, assign A t max b If the value f fsum is negative, print "Nt accepted" Else, if fsum is mre than 50, print "Part One" Else, print "Part Tw" c Let a, b and c be integers If a is zer, d nthing Otherwise, add b and c int sum If sum is less than 100, reassign 100 t sum Print the value f sum LAB MODULE 2 2

4 3 The fllwing figure shws a flwchart f a prgram that cmputes the area f a square r a triangle, as chsen by the user Write a cmplete prgram based n the flwchart 4 A prgram displays the categry f a substance based n the percentage f gld it cntains The categry is as belw: Gld cntent, gc () Categry gc 80 GP01 60 gc < 80 GP02 35 gc < 60 GP03 gc < 35 GP04 a Write the prgram using 'if' statements (Yu may write at the back f this page) b Can the prgram be written using 'switch' structure? Prvide a brief reasn 5 Write a prgram that cnverts the temperature frm celcius( C) t Fahrenheit ( F) and vice versa The user chses either ne, and the prgram will display the cnversin result The cnversin frmula are as fllw: Celsius Fahrenheit F = 9t/ Fahrenheit Celsius C = 5(t - 32)/9 6 Lcate and rectify the errrs in the segments f cde belw (Yu may test these cdes in the cmpiler Remember t include the header file <stdih> and int main()): a if hme<= 10 min = hme; b if (minute >= 60) hur = minute/600; minute = minute % 600; hur = 0; printf ("The duratin is %d hurs and %d minutes", hur, minute); LAB MODULE 2 3

5 7 A prgram assigns t the variable lumens the expected brightness f a standard light bulb whse pwer has been stred in watts Use the fllwing table: Pwer (Watts) Brightness (Lumens) a Write a flwchart fr the prgram b Write the prgram using 'if' c Rewrite the if segments using switchcase LAB MODULE 2 4