C语言全部题目及答案.docx
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C语言全部题目及答案
C语言全部题目及答案
Exercise1:
ProgrammingEnvironmentandBasicInput/Output
1.Writeaprogramthatprints“Thisismyfirstprogram!
”onthescreen.
（a）Savethisprogramontoyourowndiskwiththenameofe2-1a;
（b）RunthisprogramwithoutopeningTurboC;
（c）Modifythisprogramtoprint“Thisismysecondprogram!
”,thensaveitase2-1b.Pleasedonotoverwritethefirstprogram.
2.Writeaprogramthatprintsthenumber1to4onthesameline.Writetheprogramusingthefollowingmethods:
（a）Usingfour“printf”statements.
（b）Usingone“printf”statementwithnoconversionspecifier（i.e.no‘%’）.
（c）Usingone“printf”statementwithfourconversionspecifiers
3．（a）Writeaprogramthatcalculatesanddisplaysthenumberofminutesin15days.
（b）Writeaprogramthatcalculatesanddisplayshowmanyhours180minutesequalto.
（c）（Optional）Howabout174minutes?
ANSWERS:
#include
intmain（）
{
printf（"Thisismyfirstprogram!
"）;
return0;
}
#include
intmain（）
{
printf（"Thisismysecondprogram!
"）;
return0;
}
#include
intmain（）
{
printf（"1"）;
printf（"2"）;
printf（"3"）;
printf（"4"）;
return0;
}
#include
intmain（）
{
printf（"1234"）;
return0;
}
#include
intmain（）
{
printf（"%d%d%d%d",1,2,3,4）;
return0;
}
#include
intmain（）
{
floatdays,minutes;
days=15;
minutes=days*24*60;
printf（"Thenumberofminutesin15daysare%f\n",minutes）;
return0;
}
#include
intmain（）
{
floatminutes,hours;
minutes=180;
hours=minutes/60;
printf（"180minutesequalto%fhours\n",hours）;
return0;
}
#include
intmain（）
{
floatminutes,hours;
minutes=174;
hours=minutes/60;
printf（"174minutesequalto%fhours\n",hours）;
return0;
}
Exercise2:
DataTypesandArithmeticOperations
1.Youpurchasealaptopcomputerfor$889.Thesalestaxrateis6percent.WriteandexecuteaCprogramthatcalculatesanddisplaysthetotalpurchaseprice（netprice+salestax）.
2．Writeaprogramthatreadsintheradiusofacircleandprintsthecircle’sdiameter,circumferenceandarea.Usethevalue3.14159for“?
”.
3．Writeaprogramthatreadsintwonumbers:
anaccountbalanceandanannualinterestrateexpressedasapercentage.Yourprogramshouldthendisplaythenewbalanceafterayear.Therearenodepositsorwithdraws–justtheinterestpayment.Yourprogramshouldbeabletoreproducethefollowingsamplerun:
Interestcalculationprogram.
Startingbalance?
6000
Annualinterestratepercentage?
4.25
Balanceafteroneyear:
6255
ANSWER:
#include
intmain（）
{
floatnet_price,sales_tax,total;
net_price=889;
sales_tax=net_price*0.06;
total=net_price+sales_tax;
printf（"Thetotalpurchasepriceis%g",total）;
return0;
}
#include
intmain（）
{
printf（"Pleaseinputanumberasradius:
\n"）;
floatradius,diameter,circumference,area;
scanf（"%f",&radius）;
printf（"Thediameteris%g\n",diameter=radius*2）;
printf（"Thecircumferenceis%g\n",circumference=radius*2*3.14159）;
printf（"Theareais%g\n",area=radius*radius*3.14159）;
return0;
}
#include
intmain（）
{
floatSB,percentage,NB;
printf（"Interestcalculationprogram\n\nPleaseentertheStartingBalance:
"）;
scanf（"%f",&SB）;
printf（"PleaseentertheAnnualinterestratepercentage:
"）;
scanf（"%f",&percentage）;
NB=SB*percentage/100+SB;
printf（"\nTheBalanceafteroneyearis:
%g",NB）;
return0;
}
Exercise3:
Selectionstructure
1．WriteaCprogramthatacceptsastudent’snumericalgrade,convertsthenumericalgradetoPassed（gradeisbetween60-100）,Failed（gradeisbetween0-59）,orError（gradeislessthan0orgreaterthan100）.
2．Writeaprogramthataskstheusertoenteranintegernumber,thentellstheuserwhetheritisanoddorevennumber.
3．Writeaprogramthatreadsinthreeintegersandthendeterminesandprintsthelargestinthegroup.
ANSWER:
#include
intmain（）
{
intgrade;
printf（"Pleaseenterthegrade:
"）;
scanf（"%d",&grade）;
if（grade>=60&&grade<=100）
printf（"Passed."）;
elseif（grade>=0&&grade<60）
printf（"Failed."）;
else
printf（"Error."）;
return0;
}
#include
intmain（）
{
inta,b,c;
printf（"Pleaseenter3integernumbers\n"）;
printf（"ThenI'lltellyouwhichisthelargest\n"）;
scanf（"%d%d%d",&a,&b,&c）;
if（a>b&&a>c）
printf（"%disthelargest",a）;
elseif（b>a&&b>c）
printf（"%disthelargest",b）;
elseif（c>a&&c>b）
printf（"%disthelargest",c）;
else
printf（"They'reequal"）;
return0;
}
#include
#include
intmain（）
{
inta;
printf（"Pleaseenteranintegernumber\n"）;
printf（"ThenI'lltellyouwhetherit'sanoddorevennumber"）;
scanf（"%d",&a）;
if（a%2==0）
printf（"%disanevennumber",a）;
else
printf（"%disaoddnumber",a）;
return0;
}
Exercise4:
‘switch’statementandsimple“while”repetitionstatement
1.Writeaprogramthatreadsthreeintegersanabbreviateddate（forexample:
261294）andthatwillprintthedateinfull;forexample:
26thDecember1994.Thedayshouldbefollowedbyanappropriatesuffix,‘st’,‘nd’,‘rd’or‘th’.Useatleastoneswitchstatement.
2．WriteaCprogramthatusesawhilelooptocalculateandprintthesumoftheevenintegersfrom2to30.
3.Alargechemicalcompanypaysitssalesstaffonacommissionbasis.Theyreceive￡200perweekplus9%oftheirgrosssalesforthatweek.Forexample,someonewhosells￡5000ofchemicalsinoneweekwillearn￡200plus9%of￡5000,atotalof￡650.DevelopaCprogramthatwillinputeachsalesperson’ssalesforthepreviousweek,andprintouttheirsalary.Processoneperson’sfiguresatatime.
Entersalesinpounds（-1toend）:
5000.00
Salaryis:
650.00
Entersalesinpounds（-1toend）:
00.00
Salaryis:
200.00
Entersalesinpounds（-1toend）:
1088.89
Salaryis:
298.00
Entersalesinpounds（-1toend）:
-1
Optional：
4.Amailordercompanysellsfivedifferentproductswhoseretailpricesareshowninthefollowingtable:
ProductNumberRetailPrice（inpounds）
12.98
24.50
39.98
44.49
56.87
WriteaCprogramthatreadsinaseriesofpairsofnumbersasfollows:
（1）.Productnumber
（2）.Quantitysoldforoneday
Yourprogramshoulduseaswitchstatementtohelpdeterminetheretailpriceforeachproduct,andshoulduseasentinel-controlledlooptocalculatethetotalretailvalueofallproductssoldinagivenweek（7days）.
ANSWER:
#include
intmain（）
{
printf（"Pleaseenterthreenumbersfordate:
"）;
intday,month,year;
scanf（"%d%d%d",&day,&month,&year）;
if（day>31）
printf（"Error"）;
else
{
switch（day）
{
case1:
printf（"1st"）;
break;
case2:
printf（"2nd"）;
break;
case3:
printf（"3rd"）;
break;
case21:
printf（"21st"）;
break;
case22:
printf（"22nd"）;
break;
case23:
printf（"23rd"）;
break;
case31:
printf（"31st"）;
break;
default:
printf（"%dth",day）;
}
}
switch（month）
{
case1:
printf（"January"）;
break;
case2:
printf（"February"）;
break;
case3:
printf（"March"）;
break;
case4:
printf（"April"）;
break;
case5:
printf（"May"）;
break;
case6:
printf（"June"）;
break;
case7:
printf（"July"）;
break;
case8:
printf（"August"）;
break;
case9:
printf（"September"）;
break;
case10:
printf（"October"）;
break;
case11:
printf（"November"）;
break;
case12:
printf（"December"）;
break;
}
printf（"19%d",year）;
return0;
}
#include
intmain（）
{
inta,b;
a=0;
b=2;
while（b<=30）
{
a=a+b;
b=b+2;
}
printf（"Thesumoftheevenintegersfrom2to30is%d",a）;
return0;
}
#include
intmain（）
{
floata,b;
while（a>0）
{
printf（"Entersalesinpounds（-1toend）:
"）;
scanf（"%f",&a）;
b=200+a*0.09;
if（a==-1）
printf（""）;
elseprintf（"Salaryis%.0f\n",b）;
}
return0;
}
Exercise5:
‘for’and‘do…while”repetitionstatements
1.Writeaprogramwhichusesado/whilelooptoprintoutthefirst10powersof2otherthan0（ie.itprintsoutthevaluesof21,22,...,210）.Useaforlooptodothesame.
2.Theconstant?
canbecalculatedbytheinfiniteseries:
?
=4-4/3+4/5-4/7+4/9-4/11+....
WriteaCprogramthatusesado/whilelooptocalculate?
usingtheseries.Theprogramshouldasktheuserhowmanytermsintheseriesshouldbeused.Thusiftheuserenters‘3’,thentheprogramshouldcalculate?
asbeing4-4/3+4/5.
Nestedrepetition
3.Writeaprogramthatprintsthefollowingdiamondshape.Youmayuseprintfstatementsthatprinteitherasingleasterisk（*）orasingleblank.Maximizeyouruseofrepetition（withnestedforstatements）andminimizethenumberofprintfstatements.
*
***
*****
*******
*********
*******
*****
***
*
4.Writeaprogramtoprintatableasfollows:
1*1=1
2*1=22*2=4
3*1=33*2=63*3=9
….
9*1=99*2=189*3=279*4=369*5=459*6=549*7=639*8=729*9=81
ANSWER:
#include
intmain（）
{
inta,b;
a=0;
b=1;
do
{
a++;
b=b*2;
printf（"%d",b）;
}
while（a<=9）;
return0;
}
#include
intmain（）
{
inta;
for（a=2;a<=1024;a=a*2）
printf（"%d",a）;
return0;
}
#include
intmain（）{
doublec,pie,p;
inta,b,d,n;
printf（"Enterterms:
"）;
scanf（"%d",&a）;
printf（"Pie="）;
n=1;p=0;
while（n<=a）
{
if（n%2==0）
b=-1;
else
b=1;
pie=（4.0*b）/（2.0*n-1.0）;
d=2*n-1;
p=p+pie;
if（n>1&&n<=a）
{
if（n%2!
=0）
printf（"+"）;
elseprintf（"-"）;
}
printf（"4/%d",d）;
n++;
}
printf（"\n=%f",p）;
return0;
}
#include
intmain（）{
introw,a,b,j;
row=1;
j=4;
while（row<=5）{
for（a=j;a>=1;a=a-1）
printf（""）;
for（b=1;b<=9-2*j;b++）
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