2009年12月C语言程序设计等级考试大题参考答案一、改错题#include<stdio.h>void main(){ int a,b,c;/**/ int f; /**/ 改为：float f;clrscr();printf("Please input a b :");scanf("%d%d",/**/a,b/**/); 改为：&a, &bf=/**/ a/b; /**/ 改为：(float)a/b; 或1.0*a/b;c=(int)((f-(int)f)*10);printf("\n%f %d\n",f,c);getch();}#include <stdio.h>void find(/**/ n /**/) 改为：int n{ int a1,a2;a1=m%10;a2=m/10;if(m%3==0 &&(/**/ a1==4 && a2==4 /**/)) 改为：a1= = 4 || a2= = 4 printf("%d\n",m);}void main(){ int k;for(k=10;k<=99;k++)/**/ fun( k ) /**/; 改为：find( k )getch();}#include<stdio.h>void main(){ /**/ int a,Tag; /**/ 改为：int a,tag;int num1=0,num2=0;clrscr();printf("please input numbers :");scanf("%d",/**/ a /**/); 改为：&atag=a;/**/ if(a) /**/ continue; 改为：if (a==0) else if(a<tag) num1++;else if(a>tag) num2++;}printf("\n%d %d\n",num1,num2);getch();}#include <stdio.h>long int fsum(int n){long int k;if(n==1)/**/ k=0 /**/; 改为：k=1elsek=n*fsum(n-1);return (/**/ 1 /**/); 改为：k}void main(){ int i;long int sum;sum=0;for(i=1;i<=9;/**/ i++;i++ /**/) 改为：i++,i++ 或i=i+2 sum+=fsum(i);printf("sum=%ld\n",sum);getch();}#include<stdio.h>void main(){ int i,a=0;/**/ c1,c2; /**/ 改为：char c1,c2; clrscr();printf("Enter an 8 bit binary number :");c2=getchar();/**/ for(i=1,i<=7;i++) /**/ 改为：for(i=1;i<=7;i++) { c1=getchar();a=a*2+c1-'0';}/**/ If (c2) /**/ a=(-1)*a; 改为：if (c2==‘1’) printf("\n%d \n",a);getch();#include<stdio.h>void main( ){ int i,n;/**/ n = 1; /**/ 改为：n=0for(i=10;i<=100;i++)if(i/10==i%10){printf("%5d",i);n++;if(/**/ n%9=0 /**/) 改为：n%9==0printf("\n");}for(i=100;i<=999;i++)if(/**/ i/100==i/10 /**/) 改为：i/100==i%10{printf("%5d",i);n++;if(n%9==0)printf("\n");}getch();}#include <stdio.h>void main(){ /**/ int a(10); /**/ 改为：int a[10];int i,j,k,x;printf("Enter 10 numbers:");scanf("%d",/**/ x /**/); 改为：&xa[0]=x;for(k=1;k<=9;k++){ scanf("%d",&x);for(i=0;i<k;i++)if (a[i]>x) break;if(i<k)for(j=k;j>i;j--) a[j]=a[j-1];a[i]=x;}/**/ for(i=1;i<=10;i++) /**/ 改为：for(i=0;i<=9;i++) printf("%d ",a[i]);printf("\n");getch();}#include <stdio.h>#include <math.h>int fun( /**/ float a, b, c /**/) 改为：float a, float b, float c{ float t;int mk = 0;if(c<a){ t = a; a = c; c = t; }if(c<b){ t = b; b = c; c = t; }if( fabs( c*c - (a*a+b*b)) < 1.0e-8)mk = 1;/**/ return (1); /**/ 改为：return (mk);}main(){float a,b,c;printf("Please input three numbers(a b c):\n");scanf("%f%f%f",&a,&b,&c);if(/**/ fun(a b c) /**/== 1) 改为：fun(a, b, c)printf("Yes\n");elseprintf("No\n");getch();}#include <stdio.h>void main(){ int a[10]={0};/**/ int i, j, k,temp, /**/ 改为：int i, j, k,temp;printf("Enter 10 numbers:");/**/ for(k=1;k<10;k++) /**/ 改为：for(k=0;k<10;k++)scanf("%d",&a[k]);for(i=0;i<9;i++){ k=i;for(j=i+1;j<10;j++){ if(a[k]>a[j])k=j;}if(k!=i)/**/ {temp=a[i];a[k]=a[i];a[i]=temp;} /**/ 改为：{temp=a[k];a[k]=a[i];a[i]=temp;} }for(i=0;i<10;i++)printf("%d ",a[i]);#include <stdio.h>void main(){float a,b,c,max;float fmax(float,float,float);printf("Please input 3 numbers:\n");scanf("%f%f%f",&a,&b,&c);max=/**/ fmax(a;b;c) /**/; 改为：fmax(a, b, c)printf("The max number is:%.2f\n", max);getch();}/**/float fmax(float x, y, z) /**/ 改为：float fmax(float x, float y, float z) {float m1,m2;m1=(y>z)?y:z;m2=/**/ (x>y)?x:y; /**/ 改为：(x>m1)?x:m1;return(m2);}#include <stdio.h>void main(){ int a[20]={1,3,7,9,12,14,23,26,34,43,45,47,49,56,58,59,78,79,87,89};int left,right,mid,q,count;left=0 ;/**/ right = 19 /**/ 改为：right = 19;printf("please input a number:");scanf("%d",/**/ q /**/); 改为：&qcount=1;while(left<=right){ mid= ( left + right)/2 ;if(q==a[mid]) break;else if(q<a[mid]) right = mid-1;else left = mid+1;/**/ count--; /**/ 改为：count++;}if(left<=right)printf("%d %d\n",mid,count);else#include <stdio.h>#include <math.h>int fun(/**/ float r, x, y /**/) 改为：float r, float x, float y{ if ( sqrt(x*x+y*y) < r )return ( 1 );else 0 return (/**/ -1 /**/ ); 改为：0}void main(){ float r=-1,x,y;int bIn;while(r<0){printf("Please input radius r (r>0):\n");scanf("%f", &r);}printf("Please input the dot(x,y):\n");scanf("%f%f",&x,&y);bIn = fun(r,x,y);if(/**/ bIn = 0 /**/) 改为：bIn != 0 或bIn ==1 printf("in the circle!\n");elseprintf("out of the Circle!\n");getch();}二、填空题#include <stdio.h>#include <conio.h>void main(){ /**/ int/**/ a,b,temp;scanf("%d,%d",&a,&b);if (a<b){ /**/temp=a;a=b;b=temp;/**/}while /**/(--a>b)/**/{ if(a%3==0)printf("\n");getch();}#include <stdio.h>double fun(/**/ int n /**/){ double y = 0.0;int i,j;for(i=1;i<=n;i++){y = y +/**/ 1.0/(8+3*i) /**/;}return (/**/ y/**/);}void main(){ clrscr();printf("fun(7) = %8.3lf\n", fun(7));getch();}#include <stdio.h>void main(){int m,n;for(m=1; /**/m<=5 ; /**/ m++){ printf("\n");for(n=1;n<= /**/ m-1;/**/ n++)printf(/**/““/**/);for(n=9;n>=m*2-1;n--)printf("* ");}getch();}#include <stdio.h>main()int v=300;fun(/**/ v /**/);getch();}void fun(int m){int c1,c2;for(c1=1;/**/ c1<=30;/**/ ;c1++){ for(c2=1;c2<=15;c2++)if(c1*10+c2*20==/**/ m/**/ )printf("c1=%d,c2=%d\n",c1,c2);}}#include <stdio.h>#include <conio.h>void main(){int num1,num2,ans,flag;char op;clrscr();printf("Please input an expression:");scanf("%d%c%d", /**/ &num1,&op,&num2 /**/); flag=0;/**/ switch(op)/**/{case '+': ans=num1+num2; break;case '-': ans=num1-num2; break;case '*': ans=num1*num2; break;case '/': ans=num1/num2; break;default:{ printf("Error!\n"); flag=1; }}if /**/(flag = =0) /**/printf("%d %c %d = %d\n",num1,op,num2,ans);getch();}#include <stdio.h>{ char src[40],tag[40];void ch_pw( );printf("Please input a string: ");gets(src);strcpy(tag,src);ch_pw( tag );printf("\nThe source string: %s\n",src);printf("\nThe target string: %s\n",tag);getch();}void ch_pw(/**/ char str[ ] /**/){ char tab[4][2]={{'a','d'},{'s','f'},{'d','a'},{'f','s'}}; int j=0,i;while( str[j] ){for(i=0;i<=3;i++){ if(str[j]==tab[i][0]){ /**/ str[j]/**/=tab[i][1] ;break;}}/**/ j++;/**/ ;}}#include <stdio.h>#include <string.h>void main(){ char str[80];char c;int i;/**/ i=0; /**/printf("\nPlease input the string: ");while((c=getchar())!='\n'){if(c>='A'&&c<='Z'||c>='a'&&c<='z')/**/ str[i++]=c; /**/}str[i]= /**/ 0; (或者: ’\0’ ;)/**/puts(str);getch();}#include <stdio.h>#include <math.h>#define N 9void ivs(int a[ ]){int i,temp;for(i=0;/**/ i<N/2; /**/;i++){temp=a[i];a[i]=a[N-1-i];/**/ a[N-1-i]=temp; /**/;}}void main(){int arr[N],i;printf("Please input %d numbers:\n",N);for(i=0; i<N; i++)scanf("%d", &arr[i]);ivs(/**/ arr /**/);printf("\nInverse order is: \n");for(i=0; i<N; i++)printf("%d ", arr[i]);printf("\n" );getch();}#include <stdio.h>#include <string.h>void main(){ /**/ char /**/ str[80];int i,len, sum=0;printf("\nPlease input the string: ");gets(str);len = strlen(str);for(i=0; i<len; i++){ if(str[i]>='A'&&str[i]<='Z'||str[i]>='a'&&str[i]<='z') /**/ continue; /**/else/**/ sum++; /**/}printf("%d\n",sum);#include <stdio.h>#include <conio.h>void main(){ int hcf(int,int);int a,b,k;printf("Enter a b: ");scanf("%d%d",&a,&b);k=hcf(/**/a, b /**/);printf("H.C.F=%d \n", k);getch();}int hcf(int x,int y){ int r;r=x%y;while( r!=0 ){ x=y;y=/**/ r /**/;r=x%y ;}return (/**/ y /**/);}#include <stdio.h>#include <string.h>void main(){char s1[100], s2[100];int i,len;printf("Please input string: \n");gets(s1);len = strlen(s1);for(i=0; i<len; i++){if( s1[i] >= '1' && s1[i] <= '9')/**/ s2[i]=s1[i]-1; /**/ else if( s1[i] == '0' )/**/ s2[i]=’9’; /**/ elses2[i] = s1[i];}s2[i] =/**/ 0 (或者: ’\0’ )/**/; puts(s2);getch();}#include <stdio.h>#include <string.h>void sct(char s1[],/**/char s2[] /**/) {char * p1,*p2;p1=/**/ s1 /**/;p2=s2;while(*p1)p1++;while(*p2)*(p1++) = *(p2++);}void main(){ char str1[60]="Nothing ", str2[]="final";sct(/**/ str1 /**/ ,str2);printf("\n%s\n",str1);getch();}三、编程题#include <math.h>#include <stdio.h>double func(double x){ /**/ double y;y=(3*x*sin(x)+tan(x))/(1.5+fabs(x));return y;/**/}void main(){ clrscr();printf("func(0.26) = %6.3lf\n", func(0.26)); printf("func(5.00) = %6.3lf\n", func(5.00)); printf("func(8.50) = %6.3lf\n", func(8.50)); getch();}#include <stdio.h>int fun(int a[],int n,float *f){ /**/ int i,t=0 ;for(i=0;i<n;i++)*f=*f+a[i];*f=*f/n;for(i=0;i<n;i++)if(a[i]>*f)t++;return t;/**/}void main(){ int a[] = {23,40,8,32,18,2,9,16,27};int i,k = sizeof(a)/sizeof(int);int count=0;float aver=0.0;printf("Array a:\n");for(i=0;i<k;i++)printf("%d ",a[i]);printf("\n");count=fun(a,k,&aver);printf("aver is %f, count is %d\n",aver,count); getch();}#include <math.h>#include <stdio.h>double func(double x){ /**/double y;y=(exp(x)+sin(x-6))/(x*x+1);return y; /**/}void main(){ clrscr();printf("func(0.26) = %6.3lf\n", func(0.26)); printf("func(5.00) = %6.3lf\n", func(5.00)); printf("func(8.50) = %6.3lf\n", func(8.50)); getch();}#include <stdio.h>#include <math.h>int find(int a[],int n,float x){ /**/int i ,t; float min=fabs(x-a[0]);for(i=1;i<n;i++)if(fabs(x-a[i])<min){ min=fabs(x-a[i]);t=a[i];}return t; /**/}void main(){ int a[] = {23,40,8,32,18,2,9,16,27}; int i,k,n = sizeof(a)/sizeof(int);float x=20.3;printf("Array a:\n");for(i=0;i<n;i++)printf("%d ",a[i]);printf("\n");k=find(a,n,x);printf("It is %d\n",k);getch();}#include <stdio.h>#include <math.h>double fun1(float x){ /**/ double y;if(x<3)y=sin(x);else if(x==3)y=x;elsey=cos(2*x+1);return y; /**/}void main(){ float x;double y;clrscr();printf("Please input a number:\n"); scanf("%f",&x);y = fun1(x);printf("fun1(%.2f)=%.2f\n",x,y); getch();}#include <stdio.h>#include <math.h>int fun(int bg,int fn){ /**/int i , j, t=0;for(i=bg;i<=fn;i++){ for(j=2;j<i/2;j++)if(i%j==0)break;if(j>=i/2)t++;}return t;/**/}void main(){ int count;count=fun(100,500);printf("\nThe total of prime is %d",count); getch();}#include <stdio.h>#include <math.h>double fun1(float x){ /**/ double y;if(x<3)y=pow(2.5+fabs(x),1.0/3)/(sin(x)+3);elsey=x;return y; /**/}void main(){ float x;double y;clrscr();printf("Please input a number:\n");scanf("%f",&x);y = fun1(x);printf("fun1(%.2f)=%.2f\n",x,y);getch();}#include <stdio.h>double fun(int n){ /**/ int i ; double k=1.0,s=0;for (i=1;i<=n;i++){ s+=k/(i*(2*i+1)) ;k=-k;}return s;/**/}void main(){ int n;printf("Input n: ");scanf("%d",&n);printf("fun(%d)=%lf\n",n,fun(n));getch();}#include <stdio.h>#include <math.h>double fun1(float x){ /**/ double y;if(x<10)y=sqrt(2.5+cos(x))/(x*sin(x)+3);elsey=x*x;return y;/**/}void main(){ float x;double y;clrscr();printf("Please input a number:\n"); scanf("%f",&x);y = fun1(x);printf("fun1(%.2f)=%.2f\n",x,y); getch();}#include <stdio.h>#include <math.h>int bTrue(int a[][4],int n){ /**/int i, j, t=1;for(i=0;i<n&&t!=0;i++)for(j=0;j<n;j++)if(a[i][j]!=a[j][i])t=0;return t;/**/}void main(){ int a[4][4],i,j;int bT;printf("Input array a:\n");for(i=0; i<4; i++)for(j=0; j<4; j++)scanf("%d",&a[i][j]);bT = bTrue(a,4);if( bT == 1 )printf("Yes\n");elseprintf("No\n");getch();}#include <stdio.h>#include <math.h>double fun1(float x){ /**/ double y;if(x<100)y=(3*log10(x)-3)/(sin(x)+3);elsey=x-100;return y; /**/}void main(){ float x;double y;clrscr();printf("Please input a number:\n"); scanf("%f",&x);y = fun1(x);printf("fun1(%.2f)=%.2f\n",x,y); getch();}#include <stdio.h>#include <math.h>int fun(int a[],int n){ /**/ int i,t=a[0];float avg=0, max;for(i=0;i<n;i++)avg+=a[i];avg=avg/n;max=fabs(a[0]-avg);for(i=1;i<n;i++)if(fabs(a[i]-avg)>max){ max= fabs(a[i]-avg);t = a[i];}return t;/**/}void main(){ int a[] = {10,22,8,33,17,5,9,13,27}; int i,n = sizeof(a)/sizeof(int);int k;printf("Array a:\n");for(i=0;i<n;i++)printf("%d ",a[i]);printf("\n");k=fun(a,n);printf("It is %d\n",k);getch();}。
