-1-C語言第一組習(xí)題和答案題目如下：一、編程題（每題20分，共40分）1、編寫程序。定義數(shù)組sco存放30名學(xué)生的成績。將成績由高到低排序，并輸出排序結(jié)果和所有高于平均分?jǐn)?shù)的成績（結(jié)果保留兩位小數(shù)）。2、編寫程序。先編寫一個(gè)子函數(shù)求x，再通過主函數(shù)調(diào)用該子函數(shù)，對輸入的一個(gè)數(shù)y，求y并輸出。二、程序填空。在程序中的序號(hào)處填上正確的內(nèi)容。（每空4分，共48分）1、程序用于求兩個(gè)數(shù)的和與差。#include<stdio.h">intfun(inta,intb,int*psub){intsum;sum=a+b;_____①_____=a-b;returnsum;}voidmain(){intx,y,s1,s2;scanf(“%d%d”,_____②_____);s1=fun(x,y,_____③_____);printf(“sum=%d\nsub=%d\n”,_____④_____);}2、對于5×5的方陣，輸出其下三角的元素。1234512345623345673454567845675678956789#include<stdio.h>voidmain(){int_____①_____,i,j;for(i=0;i<5;i++)for(j=0;j<5;j++) a[i][j]=_____②_____; for(i=0;i<5;i++){for(j=0;_____③_____;j++)printf("%4d",a[i][j]);_____④_____;}}3、輸出所有的水仙花數(shù)。所謂的水仙花數(shù)是指一個(gè)3位數(shù)，其各位數(shù)字立方和等于該數(shù)本身。例如153是一水仙花數(shù)，因?yàn)?53=13+53+33#include<stdio.h>voidmain(){intn,i,j,k;for(n=100;n<=_____①_____;n++){i=n/100;//取出n的百位數(shù)j=_____②_____;//取出n的十位數(shù)k=_____③_____;//取出n的個(gè)位數(shù)if(n==_____④_____)printf("%d\n",n);}}三、寫出程序的執(zhí)行結(jié)果（每題4分，共12分）1、#include<stdio.h>voidmain(){inti,j;for(i=1;i<5;i++){for(j=1;j<=12-i;j++)printf(““);for(j=1;j<=i;j++)printf(“%4d”,i);printf(“\n”);}}2、#include<stdio.h>inta=5;voidfun(intb){inta=10;a+=b;printf("%d",a);}voidmain(){intc=20;fun(c);a+=c;printf("%d\n",a);}3、#include<stdio.h>voidsub(intx,inty,int*z){*z=x-y;}voidmain(){inta,b,c;sub(10,6,&c);sub(8,c,&b);sub(c,b,&a);printf(“%d%d%d\n”,a,b,c);}考試科目：答題：第（1）組答案：一、編程題1、#include

<stdio.h>

#include

<stdlib.h>

#include

<time.h>

#include

<math.h>

int

main()

{

//

insert

code

here...

int

n

=

100;

int

m

=

0;int

temp;

int

sco[30];

srand((unsigned)time(0));

for

(int

i

=

0

;

i

<

30

;

i++)

{

sco[i]

=

rand()%(n-m+1)+m;

}

for

(int

i

=

0;

i

<

30;

i++)

{

for

(int

j

=

0;

j

<

i;

j++)

{

if

(sco[j]

<

sco[i])

{

temp

=

sco[j];

sco[j]

=

sco[i];

sco[i]

=

temp;

}

}

}

//

輸出排序結(jié)果

printf("輸出排序結(jié)果:\n");

for

(int

i

=

0;

i

<

30;

i

++

)

{

printf("%.2f\n",(float)sco[i]);

}

float

sum

=

0;

for

(int

i

=

0;

i

<

30;

i

++

)

{

sum

=

sum

+

sco[i];

}

//求出平均值

float

average

=

sum/30;

printf("sum

=

%.2f,

average

=

%.2f\n",sum,average);

int

newSco[30];

int

count

=

0;

for

(int

i

=

0;

i

<

30;

i

++

)

{

if

(sco[i]

>

average)

{

newSco[count]

=

sco[i];

count++;

}

}

printf("所有高于平均分?jǐn)?shù)的成績:\n");

for

(int

i=

0;

i

<

count;

i

++)

{

printf("%.2f\n",(float)newSco[i]);

}

return

0;

}2、#include<stdio.h>intcompute(inta,intb){intresult=1;for(inti=0;i<b;i++){result=result*a;}returnresult;}intmain(){inta;printf("請輸入一個(gè)數(shù)，求其5次方:\n");scanf("%d",&a);printf("%d^5=%d\n",a,compute(a,5));return0;}程序填空①*psub②&x,&y③&s2④s1,s2①a[5][5]②j+i+1