Module5: Performing Administrative Tasks

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??????

• ??????
• ??????
• ?????
• ????

C?????? ---------- http//www.tup.tsinghua.edu
.cn/
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????

• 9.1 ???
• 9.2 ????
• 9.3 ????

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????

• ?C?????????????,????C?????????,???????
• ??,?????define?????????PI?
• define PI 3.14159
• ????????????????????????????????,???????????????
  ???? ??

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????
C??????????????? (1)??? (2)????
(3)???? ???????????????????????????????????C???
??,?????????? ?? define
include
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9.1 ???
9.1.1 ???????? ??????????????????????????????
???? define ??? ???
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9.1 ???
?????? input a number 2 ? y29
? ??????????? include ltstdio.hgt define M
(xx2x-1) void main() int x,y
printf("input a number") scanf("d",x)
y xM2M1 printf("yd\n",y)
??????????????? yx(xx2x-1)2(xx2x-1)
1 /?yx34x23x-1/
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8.1 ???
??,????????? difine M
xx2x-1 ???????????? Yxxx2x-12xx2
x-11 /????y x32x24x-1/
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8.1 ???
????????????? (1)????????(??)????????,?????????
??????,??????????,???????????,?????,???????,??????
????????????,???????????????????
(2)??????????,????????,???????????????
(3)???????????,???????????????????????????,???und
ef???
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8.1 ???
(4)????????????????,??????????????P206?9.2??L
(5)???????,?????????????????????????????????????
?? define PI 3.1415926 define S
PIyy / PI???????/ ???
printf("f",S) ???????
printf("f",3.1415926yy)
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(6)????????????,???????????????????
(7)???????????,?????? ?? define INT
int ??????INT????? INT a10,
body5 (8)????????????,????????????????????,??
??????????????,????????????
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? ??????????? define PR printf define D "d
" define F "f\n" include ltstdio.hgt void
main() int a012, c-8, e11 float b3.8,
d9.7, f21.08 PR(D F,a,b) PR(D F,c,d)
PR(D F,e,f)
?????? 10 3.800000 -8 9.700000 11 21.000000
??????????????????????,???????????,??????,????
????
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9.1.2 ??????? 1. ?????????? ???????????
define ??(???) ???
????????????? ??(???)
?? define N(x,y) 3xyy /??????/
kN(7,9) /????????????k 3799/
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?????? input two numbers 23 8? max23
? ????????? include ltstdio.hgt define MAX(a,b)
(agtb)?ab void main() int x,y,max
printf("input two numbers") scanf("dd",x,y)
maxMAX(x,y) printf("maxd\n",max)
maxMAX(x,y) ,?? x?y?????a?b? ???????? max(xgty)?
xy
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2. ???????????? ????????????????? (1)??????,???
????????????? ?? define MAX(a,b) (agtb)?ab
??define MAX (a,b) (agtb)?ab
(2)????????????,???????????????
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? ???????????????? include ltstdio.hgt define
S1(y) (y)(y) void main() int a,sq
printf("input a number ") scanf("d",a)
sqS1(a1) printf("sqd\n",sq)
?????? input a number 6 ? sq49
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8.1 ???
(3)?????,??????????????????????
P208
(4)??????????????,?????,??????????????
?9.4???????????????
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void main() float r,l,s,v
scanf("f",r) l2 3.1415926 r s
3.1415926 rr v4.0/3.0 3.1415926
rrr printf("r6.2f,l6.2f,s6.2f,v6
.2f\n",r,l,s,v)

• include ltstdio.hgt
• define PI 3.1415926
• define CIRCLE(R,L,S,V) L2PIRSPIRRV4.0/3.
  0PIRRR
• void main()
• float r,l,s,v
• scanf("f",r)
• CIRCLE(r,l,s,v)
• printf("r6.2f,l6.2f,s6.2f,v6.2f\n",r
  ,l,s,v)

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• 3. ???????????
• (1) ?????,??????????,??????????????????????????
  
• (2) ??????????????,??????????????????????????,?
  ???????????,?????????,??????????
• (3) ???????????????????????,????????,????????,?
  ?????????????????,??????????????
• (4) ?????????????,??????????????(?9.4 )

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(5) ???????,????????,?????????????,????????????
?? (6) ?????????,??????????????????(???????????
?????)?
?? ?????????,?????????,???????????????,?????
?????????????????????
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9.2 ????
??????????????????????????????????,???????????
????? ????include ??? ?
include lt???gt

???????????????????????,????????????
include ltstdio.hgt include ltmath.hgt
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9.2 ????
????
?? ????????????????????,??????????????,??????????
?????file2.c???????,?????????,???????????,??????(.
obj)????????????????????,??????????
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9.2 ????
??????????????? (1)??????????????????
?????(?ltstdio.hgt??)?,?????C??????????????????,????
??????????????????????????
?????(?stdio.h??)?,???????????????????,????,????
?????????????????????????????????
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9.2 ????
(2)??include?????????????,?????????,?????include??
? (3)????????,??????????????????????
??????????,?????????????
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9.3 ????
????????,?????????????,????????????????
1.???????3???
(1)ifdef ??? ???1 else ???2
endif
(2)ifndef ??? ???1 else ???2
endif
(3) if ??? ???1 else ???2
endif
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9.3 ????
2. ?????? ? ????ifdef????
?????? Hello Ted RALPH not defined
include "stdio.h" define TED 10 void main ()
ifdef TED printf("Hello Ted\n") /
?????TED,??????? / else printf("Hello
anyone\n")/ ??????TED,??????? / endif
ifndef RALPH printf ("RALPH not defined\n")/
??????RALPH,????? / endif
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? ????if???? include "stdio.h" define PI
3.14159 define R 1 void main() float c,r,s
printf ("input a number ") scanf("f",c)
if R rPIcc printf("area of round is
f\n",r) else scc printf("area of
square is f\n",s) endif
?????? input a number5? area of round is
78.539749
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THE END
THE END
THE END