西北农林科技大学年c语言模拟题答案

CH0505.txt

#include

void main()

{

int x,y;

scanf("%d",&x);

if (x>=1)

if (x>=10)

y=3*x-11;

else y=2*x-1;

else y=x;

printf("y=%d",y);

}

CH0603.txt

#include

#include

void main()

{

long int a,n,sum=0,b,i;

scanf("%d %d",&a,&n);

for(i=1;i<=n;i++)

{

b=pow(10,i);

sum+=b;

}

sum=a*sum/9;

printf("a+aa+aaa+...=%ld\n",sum);

}

CH0611.txt

# include

#include

void main()

{

float a,x,x1,x2=1.0;

scanf("%f",&a);

x1=(x2+a/x2)/2;

while(fabs(x2-x1)>=pow(10,-5))

{ x2=x1;

x1=(x2+a/x2)/2;

}

x=x1;

printf("x=%.5f",x);

}

CH0814.txt

#include "stdio.h"

#define N 5

#define M 3

float score[N][M];

float a_stu[N],a_cour[M];

int r,c;

void main()

{float s_var();

void input_stu();

void aver_stu();

void aver_cour();

int i,j;

input_stu();

aver_stu();

aver_cour();

for (i=0;i

printf("%.3f ",a_stu[i]);

printf("\n");

for(j=0;j

printf("%.3f ",a_cour[j]);

printf("\n");

printf("d=%.3f",s_var());

}

void input_stu()

{

int i,j;

for(i=0;i

for (j=0;j

scanf("%f",&score[i][j]);

}

void aver_stu()

{

int i,j;

float s;

for(i=0;i

{

for(j=0,s=0;j

s+=score[i][j];

a_stu[i]=s/3.0;

}

}

void aver_cour()

{

int i,j;

float s;

for(j=0;j

{s=0;

for(i=0;i

s+=score[i][j];

a_cour[j]=s/(float)N;

}

}

float s_var()

{int i;

float sumx,sumxn;

sumx=0.0;

sumxn=0.0;

for(i=0;i

{

sumx+=a_stu[i]*a_stu[i];

sumxn+=a_stu[i];

}

return(sumx/N-(sumxn/N)*(sumxn/N));

}

CH1005.txt

#include"stdio.h"

void main()

{

int i,k,m,n,num[50],*p;

scanf("%d",&n);

p=num;

for(i=0;i

*(p+i)=i+1;

i=0;

k=0;

m=0;

while(m

{

if(*(p+i)!=0)

k++;

if(k==3)

{

*(p+i)=0;

k=0;m++;

}

i++;

if(i==n) i=0;

}

while(*p==0)

p++;

printf("%d\n",*p);

}

CH1007.txt

#include"stdio.h"

void main()

{

void copystr(char *p1,char *p2,int m);

int m;

char str1[20],str2[20];

gets(str1);

scanf("%d",&m);

copystr(str1,str2,m);

printf("%s",str2);

}

void copystr(char *p1,char *p2,int m)

{

int n;

n=0;

while (n

{

n++;

p1++;}

while(*p1!='\0')

{