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ᑕ
ଧ
ᦡ
ᦇ
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Ꮠ
ᕮ ̵ ֛ ຍ
Ԉ አᴯ
2014-2015
ଙ
ᒫ
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๗ᒫ
9
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ᰒ21
.
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.
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2
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አ49.1.1
ᛔ
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ᒈ
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ಁ
ᛔ
૩
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ᕮ
ֺ ই
҅ Ӟ
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̵ ݩ
ন
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౮
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_
1
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ժ
ԏ
ጱ
ᘶ
ᔮstruct
student{int
num;char
name[20];char
sex;int
age;float
score;char
addr[30];};由程序设计者指定了一个结构体类型structstudent它包括num,
name,sex,
age,
score,
addr等不同类型的成员ಁ
ก
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;…
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1
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զ
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ᦇ
҅ ֺ ইᦜ
ग़
ᐿ
ᕮ
֛ ᔄ
struct
teacherstruct
workerstruct
dateᒵ
ᕮ
֛ ᔄ
–
ݱ
ᛔ
۱
ތ
ӧ
ݶ
ጱ
౮
ާ(2)
౮
ާ᧔
ก
ғ
ݢ
զ
॒ ԭ
ݚ
Ӟ
ӻ
ᕮ
֛ ᔄ
struct
date{int
month;
int
day;
int
year;};struct
student{int
num;char
name[20];char
sex;int
age;struct
date
birthday;char
addr[30];};᧔
ก
ғ(2)
౮
ާ
ݢ
զ
॒ ԭ
ݚ
Ӟ
ӻ
ᕮ
֛ ᔄ
numnamesexagebirthdayaddrmonthdayyear#include
<stdio.h>struct
date{int
month;int
day;int
year;};struct
student{int
num;char
name[20];char
sex;int
age;struct
date
birthday;char
addr[30];};int
main(){numnamenamenamenamenamesexagebirthdayaddraddraddraddraddraddraddraddr4॒
printf("%lu\n",sizeof(struct
date));printf("%lu\n",sizeof(struct
student));return0;}11#include
<stdio.h>struct
date{int
month;int
day;int
year;};struct
student{int
num;char
name[20];int
age;struct
date
birthday;char
addr[30];char
sex;};int
main(){4
॒
numnamenamenamenamenameagebirthdaybirthdaybirthdayaddraddraddraddraddraddraddraddrsexprintf("%lu\n",sizeof(struct
date));printf("%lu\n",sizeof(struct
student));return0;}129.1.2
ਧ
Ԏ
ᕮ
֛ ᔄ
ݒ
ڹ
ᶎ
ݝ
ฎ
ୌಁ
ᒈ
ԧ
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୮ԭ Ӟ ӻ ཛྷ ҅ ଚ
ဌ
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Ӿ
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෫֛
හ ഝ
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ᕹ
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ಁܔ
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s
t
ru
c
t
student҅ݢզአ
ਙ
ਧ
Ԏ
ݒ
ᰁstruct
student
student1,student2;ᕮ
֛
ᔄ
ݷ
ᕮ
ݒ
֛
ᰁݷ1.
ಁ
ก
ᕮ
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s
t
ru
c
t
student҅ݢզአ
ਙ
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Ԏ
ݒ
ᰁstruct
student
student1,student2;10001Zhang
XinM1990.5Shanghaistudent110002Wang
LiF2098Beijingstudent22
.
ಁ
กᔄ
ጱ
ݶ
ਧ
Ԏ
ݒ
struct
student{int
num;charname[20];charsex;intage;float
score;char
addr[30];}student1,student2;3.
ӧ
ਧ
ᔄ
ݷ
ᘒፗ
ള
ਧ
Ԏ
ᕮ
֛
ᔄ
ݒ
Ӟ
୵ ॒ ԅ
:struct{
౮
ާ
}
ݒݷ
;
ਧ
ԧ
Ӟ
ӻ
෫
ݷ
ጱ
ᕮ
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ᔄ
17᧔
ก
ғ(
1
)
ᕮ
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Ө
ᕮ
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̶ݶ
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̵ ॒
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ᰒᓒ
҅ᘒӧ
ᚆ
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ᔄ
ᩙᰒ
̵ ॒
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̶
ᖫ
ᦲ
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ᑮ
1819(2)
ᕮ
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Ӿ
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ݢ
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զ
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ԫ
ᘏ
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դ
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Ӟ
̶(3)
ᕮ
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౮
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ܨ
“
ऒ
”
҂҅
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ᇿ
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Ө
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୮
ԭ
ฦ
ݒ
ᰒ9.1.3
ᕮ
ݒ
֛
ᰒ
ጱ
ত
۸
አֺ9.1
Ӟ
ӻ
ኞ
ጱ
מ
௳
(
۱
ೡ
̵ ݩ
ন
̵ ݷ
֘
̵
)
න
Ӟ
ӻ
ᕮ
ݒ
֛
ᰒ
Ӿ҅
ᆐ
ݸ
ᰒ
ᰒ
ӻ
ኞ
ጱ
מ
௳ᥴ
ᰒ
ғ
ᑕ
ଧ
Ӿ
ᛔ
૩
ୌ॒
ᒈ
Ӟ
ӻ
ᕮ
֛
ᔄ
҅
۱
ೡ
ํ
ኞ
מ
௳
ጱ
ݱ
౮
ާᆐ
ݸ
አ
ਙ
ਧ
Ԏ
ᕮ
ݒ
֛
ᰒ
҅
ݶ
ᩙᰒ
զ ํݸ
ᰒ
ᧆ
ᕮ
ݒ
֛
ᰒ
ጱ
ݱ
౮
ާ20#include
<sint
main()structint
num;
char
name[20];char
sex;
char
addr[40];}
student1={10101,"Li
Lin”,’M',"No.35
Beisihuan
Middle
Road"};printf("NO.:%d\nname:%s\nsex:%c\naddress:%s\n",student1.num,
,student1.sex,student1.addr);return0;}student1.sex,student1.addr);return0;}#include
<stdio.h>int
main(){struct
student{int
num;
char
name[20];char
sex;
char
addr[40];}
student1={10101,"Li
Lin”,’M',"No.35
Beisihuan
Middle
Road"};printf("NO.:%d\nname:%s\nsex:%c\naddress:%s\n",student1.num,
,return0;}#include
<stdio.h>int
main(){struct
student{int
num;
char
name[20];char
sex;
char
addr[40];}
student1={10101,"Li
Lin”,’M',"No.35
Beisihuan
Middle
Road”};student1.num=10010;
//对printf("%s\n",student1);
//错#include
<stdio.h>struct
date{int
month;
intstruct
student{int
num;
char
name[20];
struct
date
birthday;char
sex;
char
addr[40];};int
main(){struct
student
student1={10101,"Li
Lin”,{10,26,1982},
‘M’,"No.35
Beisihuan
Middle
Road"
};student1.num=10010;
//对student1.birthday.month=11;//对return0;}24return0;}25//对//对struct
student
student2;student2=student1;student2.num++;#include
<stdio.h>struct
date{int
month;
int
day;
int
year;};struct
student{int
num;
char
name[20];
struct
date
birthday;char
sex;
char
addr[40];};int
main(){struct
student
student1={10101,"Li
Lin”,{10,26,1982},
‘M’,"No.35
Beisihuan
Middle
Road"
};return0;}26#include
<stdio.h>struct
date{int
month;
int
day;
int
year;};struct
student{int
num;
char
name[20];
struct
date
birthday;char
sex;
char
addr[40];};int
main(){struct
student
student1={10101,"Li
Lin”,{10,26,1982},
‘M’,"No.35
Beisihuan
Middle
Road"
};int
sum;struct
student
student2;student2.num=student1.num;
//对sum=student1.num+student2.num;
//对27#include
<stdio.h>struct
student{int
num;
char
name[20];char
sex;
char
addr[40];};int
main(){struct
student
student1={10101,"Li
Lin”,{10,26,1982},
‘M’,"No.35
Beisihuan
Middle
Road"
};scanf("%d,%s,%c,%s”,&student1);//错return
0;}scanf("%d",
&student1.num);printf("%p",
&student1);//对//对ֺ9.2
ᰒӷ
ӻ
ኞ
ጱ
̵
ݩ
ন
ݷ
౮
ᖂ
҅
ᰒ
౮ṛ
ኞ
ጱ
̵ ݩ
ন
ݷ
౮
ᖂᖂ
ᥴ
ᰒ
ғ
(
1
)
ਧԎӷӻᕮፘݶጱᕮݒ֛ᰒstudent
1
student2Ҕ(
2
)
ᰒ ӷ
ӻ
ኞ
ጱ
̵
ݩ
ন
ݷ
౮
ᖂ
Ҕ(
3
)
༷
ӷӻ
ኞጱ
౮
ᖂ
҅
ই
ኞ
1
ጱ
౮
ᖂ
ṛ
ԭ
ኞ
2
҅
੪
ᰒ
ኞ
1
ጱ౮
ᖂ
ṛ
ԭ
ኞ
1
҅
੪
ᰒԫ
ᘏ
ፘ
ᒵ
҅ ᰒ
מ
௳
҅
ই
ኞ
2
ጱ
ኞ
2
ጱ
מ
௳
̶
ই
2
ӻ
ኞ
ጱ
מ
௳#include
<stdio.h>int
main(){struct
student{int
num;
char
name[20];float
score;}
student1,student2;scanf("%d%s%f",
&student1.num,,
&student1.score);scanf("%d%s%f",
&student2.num,,
&student2.score);printf("The
higher
score
is:\n");if
(student1.score>student2.score)printf("%d
%s
%6.2f\n",
student1.num,,
student1.score);else
if
(student1.score<student2.score)printf("%d
%s
%6.2f\n",
student2.num,,
student2.score);else{printf("%d
%s
%6.2f\n",
student1.num,,
student1.score);printf("%d
%s
%6.2f\n",
student2.num,,
student2.score);}return
0;}9.2
ᕮ
֛
හ
ᕟֺ9.3
ํ
3
ӻ
ײ
Ո҅
༷
ӻ
༷
ݝ
ᚆ
ಭ
ᐥ
ӞՈ҅
ᥝ
ᖫ
Ӟ
ӻ
ᕹ
ᦇ
ᐥ
ጱ
ᑕ
ଧ
҅ ݸᰒ
ᩙᰒ Ո ጱ ݷ ॒ ҅ ํ
ݸ
ᰒ
ݱՈ
ᐥ
ᕮ
̶31ᥴ
ᰒ
ғ–
॒
ก
Ӟ
ӻ
ᕮ
֛
හ
ᕟ
҅
හ
ᕟ
Ӿ
۱
ތ
3
ӻ
ᔰ– ༷
ӻ ᔰ
Ӿ
ጱ
מ
௳
ଫ
۱
ೡ
ײ
Ո
ጱ
ন
ݷ
(
॒
ᒧ
හ
ᕟ
)
ᐥ
හ
(
ෆ
)– ᰒ ᩙᰒ
Ո
ጱ
ন
҅
ݷ
ᆐ
ݸ
Ө
හ
ᕟ ᔰ
Ӿ
ጱ“
ন
ݷ
”
౮
ާ
༷
҅
ই
ፘ
҅
ݶ
੪
ᕳ
ᰒ
ӻᔰ
Ӿ
ጱ
“
ᐥ
හ
”౮
ާ1
ᔰ
ጱ– ᰒ ಅ ํ ጱ מ ௳32#include
<stdio.h>#include
<string.h>struct
{char
name[20];int
count;}
candidate[3]={“Li”,0,"Zhang",0,"Sun",0};全局的结构体数组Li0Zhang0Sun0namecountcandidate[0]int
main(){int
i,j;char
name[20];//保存输⼊的候选⼈
for
(i=1;i<=10;i++){//投票⼗次scanf("%s",
name);for(j=0;j<3;j++)if(strcmp(name,
candidate[j].name)==0)candidate[j].count++;}for(i=0;i<3;i++)printf("%5s:%d\n",
candidate[i].name,candidate[i].count);return
0;}int
main(){int
i,j;char
name[20];//保存输⼊的候选⼈
for
(i=1;i<=10;i++){//投票⼗次scanf("%s",
name);for(j=0;j<3;j++)if(strcmp(name,
candidate[j].==0)candidate[j].count++;}for(i=0;i<3;i++)printf("%5s:%d\n",
candidate[i].name,candidate[i].count);return
0;}᧔
ก
ғ(
1
)
ਧԎᕮ֛හᕟӞ୵
॒
ฎ
ɠstruct
ᕮ
ݷ{
౮ ާ
ᰒ } හ ᕟ ݷ [ හ ᕟ ଶ ] ;
ɡ ॒
ก
Ӟ ӻ ᕮ
֛ ᔄ
҅ ᆐ
ݸአ
ྌ ᔄ
ਧ
Ԏᕮ ֛ හ
ᕟ
ғ
හ
ᕟ
ݷ
[හ
ᕟ
ଶ
];ᕮ
֛ ᔄ
ই
ғstructcandidate[3];᧔
ก
ғ
(
2
)ᕮ֛හᕟਧԎහᕟ
ጱ
ݸ
ᶎ
Ӥ
ғত۸ጱ୵
॒
ฎ={
};ই
ғstruct
candidate[3]={"Li",0,"Zhang",0,“Sun",0};ֺ9.4
ํ
n
ӻ
ኞ
ጱ
מ
௳
(
۱
ೡ
̵
ݩ
ন
̵
ݷ
౮ᖂ
)
҅
ᥝ
ೲ
ᆙ
౮
ᖂ
ጱ
ṛ
֗
ᶲ
ଧ
ᰒ
ݱ
ኞጱ
מ
௳ᥴ
ᰒ
ғ
አ
ᕮ
֛
හ
ᕟ
॒
න
n
ӻ
ኞ
מ
௳አೠဩ
ݱᔰᰒᰒഭଧ(ᰒᰒ༷
ጱฎݱ
ᔰ
Ӿ
ጱ
౮
ᖂ
)38#include
<stdio.h>#define
N
5struct
student{int
num;
char
name[20];
float
score;};int
main(){struct
student
stu[N]={{10101,
"Zhang",
78},{10103,
"Wang",
98.5},{10106,
"Li",
86},{10108,
"Ling",
73.5},{10110,
"Sun",
100}};struct
student
temp;int
i,j,k;printf("The
order
is:\n");for(i=0;i<N-1;i++){k=i;for(j=i+1;j<N;j++)if(stu[j].score>stu[k].score)k=j;temp=stu[k];stu[k]=stu[i];stu[i]=temp;}for(i=0;i<N;i++)printf("%6d
%8s%6.2f\n",stu[i].num,stu[i].name,stu[i].score);printf("\n");return
0;}ᕮ
ݒ ֛ ᰒ
Ի
ഘ
҅
9.3
ᕮ
֛
ݻᕮ֛ጱᰒݒᰒ෬ݢզݻᕮݒ
֛
ᰒ
҅
Ԟ
ݢ
զ
አ
ݻ
ᕮ
֛
හ
ᕟ
Ӿ
ጱ
ᔰ֕
ฎ
҅
ᰒ
ݒ
ᰒ
ጱ
च
ᔄ
ᶳ
Ө
ᕮ
ݒ
֛
ᰒጱ
ᔄ
ፘ
ֺ ̶ ݶ
ই
ғstruct
student
*pt;41ᕮ
ጱֺ9.5
ᰒ
ݻ
ᕮ
ݒ
֛
ᰒ
ጱ
ᰒ
ݒ
ᰒ
ᰒݒ
֛
ᰒ
Ӿ
౮
ާ
מ
௳ᥴ
ᰒ
ғ
૪
ํ
Ꭳ
ᦩ
ጱ
च
Ꮠ
Ӥ҅
ᥝᥴ
ӷ
ӻ
ғ–
ெ॒
ᕮ
ݒ ֛ ᰒ
౮
ާ
ᩙᰒ
Ҕ–
ெ॒ᰒݻᕮݒ֛ᰒጱᰒᦢᕮݒ
֛
ᰒ
Ӿ
౮
ާ42#include
<stdio.h>#include
<string.h>struct
student{long
num;
charname[20];
charsex;
floatscore;};int
main(){struct
student
stu_1;stu_1.num=10101;strcpy(stu_1.name,"Li
Lin");stu_1.sex='M';stu_1.score=89.5;printf("No.:%ld\n",stu_1.num);printf("name:%s\n",stu_1.name);printf("sex:%c\n",stu_1.sex);printf("score:%5.1f\n",stu_1.score);return
0;}10101Li
LinM89.5stu_1printf(“sex:%c\n
,stu_1.sex);printf("score:%5.1f\n",stu_1.score);return
0;}10101Li
LinM89.5stu_1pint
main(){struct
student
stu_1;struct
student
*
p;p=&stu_1;stu_1.num=10101;strcpy(stu_1.name,"Li
Lin");stu_1.sex='M';stu_1.score=89.5;printf(“No.:%ld\n”,stu_1.num);(*p).numprintf(“name:%s\n
stu_1.name);(*p).name(*p).sex(*p).score᧔
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ᰁ௳#include
<stdio.h>struct
student{int
num;char
name[20];char
sex;int
age;};struct
student
stu[3]={{10101,"Li
Lin",'M',18},{10102,"Zhang
Feng",'M',19},{10104,"Wang
Min",'F',20}};stu[2]int
main(){struct
student
*p;printf("No.\tName\tSex\tAge\n");for(p=stu;p<stu+3;p++)printf("%5d\t%-20s\t%2c\t%4d\n",p->num,
p->name,p->sex,p->age);}10101Li
LinM1810102Zhang
FangM1910104Wang
MinF20stu[0]stu[1]int
main(){struct
student
*p;printf("No.\tName\tSex\tAge\n");for(p=stu;p<stu+3;p++)printf("%5d\t%-20s\t%2c\t%4d\n",p->num,
p->name,p->sex,p->age);}10101Li
LinM1810102Zhang
FangM1910104Wang
MinF20stu[0]stu[1]pstu[2]int
main(){nstruct
studeprintf("No.\tName\tSex\tAge\n");for(p=stu;p<stu+3;p++)printf("%5d\t%-20s\t%2c\t%4d\n",p->num,
p->name,p->sex,p->age);}10101Li
LinM1810102Zhang
FangM1910104Wang
MinF20stu[0]stu[1]pstu[2]int
main(){ntstruct
studeprintf("No.\for(p=stu;p<stu+3;p++)printf("%5d\t%-20s\t%2c\t%4d\n",p->num,
p->name,p->sex,p->age);}10101Li
LinM1810102Zhang
FangM1910104Wang
MinF20stu[0]stu[1]stu[2]p9.4
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̶ ํ
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N
=
3#include
<stdio.h>#define
N
3
struct
student{int
num;char
name[20];float
score[3];float
aver;};int
main(){void
input(struct
studentstruct
student
max(structvoid
print(struct
studentstu[]);student
stu[]);stu);struct
student
stu[N],
*p=stu;input(p);print(max(p));}void
input(struct
student
stu[]){int
i;printf(“请输⼊各学⽣的信息：学号、 、三⻔课成绩:\n");for(i=0;i<N;i++){scanf("%d
%s
%f
%f
%f",&stu[i].num,stu[i].name,&stu[i].score[0],&stu[i].score[1],&stu[i].score[2]);stu[i].aver=(stu[i].score[0]+stu[i].score[1]+stu[i].score[2])/3.0;10101Li78899888.33ᰒ
̵
ݩ
নݷ
ӣ
᧞
ᑕᦇᓒ
ଘ౮}}stu[0]stu[1]stu[2]stuvoid
input(struct
student
stu[]){int
i;printf(“请输⼊各学⽣的信息：学号、 、三⻔课成绩:\n");for(i=0;i<N;i++){scanf("%d
%s
%f
%f
%f",&stu[i].num,stu[i].name,&stu[i].score[0],&stu[i].score[1],&stu[i].score[2]);stu[i].aver=(stu[i].score[0]+stu[i].score[1]+stu[i].score[2])/3.0;10101Li78899888.3310103Wang98.5876984.83ᰒ
̵
ݩ
নݷ
ӣ
᧞
ᑕᦇᓒ
ଘ౮}}stu[0]stu[1]stu[2]stuvoid
input(struct
student
stu[]){int
i;printf(“请输⼊各学⽣的信息：学号、 、三⻔课成绩:\n");for(i=0;i<N;i++){scanf("%d
%s
%f
%f
%f",&stu[i].num,stu[i].name,&stu[i].score[0],&stu[i].score[1],&stu[i].score[2]);stu[i].aver=(stu[i].score[0]+stu[i].score[1]+stu[i].score[2])/3.0;10101Li78899888.3310103Wang98.5876984.8310106Sun8876.58984.5ᰒ
̵
ݩ
নݷ
ӣ
᧞
ᑕᦇᓒ
ଘ౮}}stu[0]stu[1]stu[2]stustruct
student
max(struct
student
stu[]){int
i,m=0;stu10101Li78899888.3310103Wang98.5876984.8310106Sun8876.58984.5for(i=0;i<N;i++)stu[0]stu[1]stu[2]if
(stu[i].aver>stu[m].aver)m=i;return
stu[m];}
ࢧํ
य़10101Li7889
98
88.3310103
Wang98.5
87
69
84.8310106
Sun
88
76.5
89
84.5studvoid
print(struct
student
stud){printf("\n成绩最⾼的学⽣是:\n");printf(“学号:%d\n
:%s\n三⻔课成绩:%5.1f,%5.1f,%5.1f\n平均成绩:%6.2f\n",stud.num,
,
stud.score[0],stud.score[1],
stud.score[2],
stud.aver);}scorenum
nameaverstu[0]stu[1]stu[2]զ
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3
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head12491249A1356
147510211356B1475C1021D\0१ᰁ᱾
ฎӞᐿଉᥠጱ
ᥝ
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score;struct
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ୌ॒
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1010189.510103901010785ֺ9.8
ୌಁ
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ᅩnumscorenext1010189.51010390aᕮᅩbᕮᅩcᕮᅩscoreheadnumᥴ
ғhead=&a;b.next=&c;next1010785NULLa.next=&b;c.next=NULL;#include
<stdio.h>struct
student{int
num;float
score;struct
student
*next;};int
main(){struct
student
a,
b,
c,
*head,
*p;a.num=10101;
a.score=89.5;b.num=10103;
b.score=90;c.num=10107;
c.score=85;head=&a;a.next=&b;b.next=&c;c.next=NULL;p=head;do{printf("%d%5.1f\n",
p->num,
p->score);p=p->next;}while(p!=NULL);return
0;}1010189.51010390aᕮᅩbᕮᅩcᕮᅩ1010785NULLnumscorenextheadpp=head;do{printf("%d%5.1f\n",
p->num,
p->score);p=p->next;
/
/
ፘ
୮
ԭp
=
&
b
;}while(p!=NULL);1010189.51010390aᕮᅩbᕮᅩcᕮᅩ1010785NULLnumscorenextheadpp=head;do{printf("%d%5.1f\n",
p->num,
p->score);p=p->next;
/
/
ፘ
୮
ԭp
=
&
c
;}while(p!=NULL);p=head;do{printf("%d%5.1f\n",
p->num,
p->score);1010189.51010390bᕮᅩcᕮᅩ1010785NULLnumscorenextheadpᶉ
ಁ
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aᕮᅩp=p->next;
//ፘ୮ԭp=NULL;}while(p!=NULL);9.5.3ୌ
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int
size);其作用是在内存的动态区中分配一个长度为size的连续空间函数的返回值是所分配区域的第一个字节的地址，或者说，此函数是一个指针型函数，返回的指针指向该分配域的开头位置85malloc
හmalloc(100);开辟100字节的临时分配域，函数返回值为其第1个字节的地址注意指针的基类型为void，即不指向任何类型的数据，只提供一个地址如果此函数未能成功地执行（例如内存空间不足），则返回空指针(NULL)86calloc
හ其函数原型为void
*calloc(unsigned
n,unsigned
size);其作用是在内存的动态
区中分配n个单位长度为size的连续空间，这个空间一般比较大，足以保存一个数组。87calloc
හ用calloc函数可以为一维数组开辟动态
空间，n为数组元素个数，每个元素长度为size。这就是动态数组。函数返回指向所分配域的起始位置的指针；如果分配不成功，返回NULL。如：int
*q=(int
*)calloc(100,
sizeof(int));开辟100×4个字节(假定int类型占据4个字节)的临时分配域，把起始地址赋给整型指针变量q88realloc
හ其函数原型为void
*realloc(void
*p,
unsigned
int
size);如果已经通过malloc函数或calloc函数获得了动态空间，想改变其大小，可以用recalloc函数重新分配。89realloc
හ用realloc函数将p所指向的动态空间的大小改变为size。p的值不变。如果重分配不成功，返回NULL。如realloc(p,
50);将p所指向的已分配的动态空间改为50字节90free
හ其函数原型为void
free(void
*p);其作用是
指针变量ｐ所指向的动态空间，使这部分空间能重新被其他变量使用。p应是最近一次调用calloc或mallocrealloc函数时得到的函数返回值。91free
හfree(p);指针变量ｐ所指向的已分配的动态空间free函数无返回值92以上4个函数的
在stdlib.h头文件中，在用到这些函数时应当用#include
<stdlib.h>指令把stdlib.h头文件包含到程序文件中。9394void
ᔄ
例建立动态数组，输入5个学生的成绩，另外用一个函数检查其中有无低于60分的，输出不合格的成绩。95void
ᔄ
解题思路：用malloc函数开辟一个动态内存区域，用来存5个学生的成绩，会得到这个动态域第一个字节的地址，它的基类型是void型。用一个基类型为int的指针变量p1来指向动态数组的各元素，并输出它们的值。但必须先把malloc函数返回的void指针转换为整型指针，然后赋给p1#include
<stdio.h>#include
<stdlib.h>void
check(int
*);int
main(){int
*p1,
i;p1=(int
*)malloc(5*sizeof(int));for(i=0;i<5;i++)scanf("%d",p1+i);check(p1);free(p1);return
0;}96void
check(int
*p){int
i;printf("不及格成绩包括:");for(i=0;i<5;i++)if
(p[i]<60)printf("%d
",p[i]);printf("\n");}97ֺ9.9 ୌ॒
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stud
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