!!!最新2009年12月C语言大题参考答案.doc

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#includevoid 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, &b f=/*/ a/b; /*/ 改为：(float)a/b; 或1.0*a/b; c=(int)(f-(int)f)*10); printf(n%f %dn,f,c); getch();#include 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(%dn,m);void main() int k; for(k=10;k=99;k+) /*/ fun( k ) /*/; 改为：find( k ) getch();#includevoid main() /*/ int a,Tag; /*/ 改为：int a,tag; int num1=0,num2=0; clrscr(); printf(please input numbers :); scanf(%d,/*/ a /*/); 改为：&a tag=a; while(a) scanf(%d,&a); /*/ if(a) /*/ continue; 改为：if (a=0) else if(atag) num2+; printf(n%d %dn,num1,num2); getch();#include long int fsum(int n) long int k; if(n=1) /*/ k=0 /*/; 改为：k=1 else k=n*fsum(n-1); return (/*/ 1 /*/); 改为：kvoid 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=%ldn,sum); getch();#includevoid 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) printf(n%d n,a); getch();#includevoid main( ) int i,n; /*/ n = 1; /*/ 改为：n=0 for(i=10;i=100;i+) if(i/10=i%10) printf(%5d,i); n+; if(/*/ n%9=0 /*/) 改为：n%9=0 printf(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 void main() /*/ int a(10); /*/ 改为：int a10; int i,j,k,x; printf(Enter 10 numbers:); scanf(%d,/*/ x /*/); 改为：&x a0=x; for(k=1;k=9;k+) scanf(%d,&x); for(i=0;ix) break; if(ii;j-) aj=aj-1; ai=x; /*/ for(i=1;i=10;i+) /*/ 改为：for(i=0;i=9;i+) printf(%d ,ai); printf(n); getch();#include #include int fun( /*/ float a, b, c /*/) 改为：float a, float b, float c float t; int mk = 0; if(ca) t = a; a = c; c = t; if(cb) 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(Yesn); else printf(Non); getch();#include void main() int a10=0; /*/ int i, j, k,temp, /*/ 改为： int i, j, k,temp; printf(Enter 10 numbers:); /*/ for(k=1;k10;k+) /*/ 改为：for(k=0;k10;k+) scanf(%d,&ak); for(i=0;i9;i+) k=i; for(j=i+1;jaj) k=j; if(k!=i) /*/ temp=ai;ak=ai;ai=temp; /*/ 改为：temp=ak;ak=ai;ai=temp; for(i=0;i10;i+) printf(%d ,ai); printf(n); getch();#include 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:%.2fn, max); getch();/*/float fmax(float x, y, z) /*/ 改为：float fmax(float x, float y, float z) float m1,m2; m1=(yz)?y:z; m2=/*/ (xy)?x:y; /*/ 改为：(xm1)?x:m1; return(m2);#include void main() int a20=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：&q count=1; while(left=right) mid= ( left + right)/2 ; if(q=amid) break; else if(qamid) right = mid-1; else left = mid+1; /*/ count-; /*/ 改为：count+; if(left=right) printf(%d %dn,mid,count); else printf(-1 n); getch();#include #include int fun(/*/ float r, x, y /*/) 改为：float r, float x, float y if ( sqrt(x*x+y*y) r ) return ( 1 ); else return (/*/ -1 /*/ ); 改为：0 void main() float r=-1,x,y; int bIn; while(r0):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); else printf(out of the Circle!n); getch();二、填空题#include #include void main() /*/ int /*/ a,b,temp; scanf(%d,%d,&a,&b); if (ab) /*/ if(a%3=0) printf( %d ,a); printf(n); getch();#include 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) = %8.3lfn, fun(7); getch();#include void main() int m,n; for(m=1; /*/ m=5 ; /*/ m+) printf(n); for(n=1;n=m*2-1;n-) printf(* ); getch();#include main() void fun(int); 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=%dn,c1,c2); #include #include 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 = %dn,num1,op,num2,ans); getch();#include #include void main() char src40,tag40; void ch_pw( ); printf(Please input a string: ); gets(src); strcpy(tag,src); ch_pw( tag ); printf(nThe source string: %sn,src); printf(nThe target string: %sn,tag); getch();void ch_pw(/*/ char str /*/) char tab42=a,d,s,f,d,a,f,s; int j=0,i; while( strj ) for(i=0;i=3;i+) if(strj=tabi0) /*/ strj /*/=tabi1 ; break; /*/ j+; /*/ ; #include #include void main() char str80; char c; int i; /*/ i=0; /*/ printf(nPlease input the string: ); while(c=getchar()!=n) if(c=A&c=a&c=z) /*/ stri+=c; /*/ stri= /*/ 0; (或者: 0 ;) /*/ puts(str); getch();#include #include #define N 9void ivs(int a )int i,temp; for(i=0;/*/ iN/2; /*/;i+) temp=ai; ai=aN-1-i;/*/ aN-1-i=temp; /*/; void main() int arrN,i; printf(Please input %d numbers:n,N); for(i=0; iN; i+) scanf(%d, &arri); ivs(/*/ arr /*/); printf(nInverse order is: n); for(i=0; iN; i+) printf(%d , arri); printf(n ); getch();#include #include void main() /*/ char /*/ str80; int i,len, sum=0; printf(nPlease input the string: ); gets(str); len = strlen(str); for(i=0; i=A&stri=a&stri=z) /*/ continue; /*/ else /*/ sum+; /*/ printf(%dn,sum); getch();#include #include 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 #include void main() char s1100, s2100; int i,len; printf(Please input string: n); gets(s1); len = strlen(s1); for(i=0; i= 1 & s1i = 9) /*/ s2i=s1i-1; /*/ else if( s1i = 0 ) /*/ s2i=9; /*/ else s2i = s1i; s2i =/*/ 0 (或者: 0 ) /*/; puts(s2); getch();#include #include void sct(char s1,/*/ char s2 /*/)char * p1,*p2; p1=/*/ s1 /*/; p2=s2; while(*p1) p1+; while(*p2) *(p1+) = *(p2+); void main() char str160=Nothing , str2=final; sct(/*/ str1 /*/ ,str2); printf(n%sn,str1); getch();三、编程题#include #include 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) = %6.3lfn, func(0.26); printf(func(5.00) = %6.3lfn, func(5.00); printf(func(8.50) = %6.3lfn, func(8.50); getch(); #include int fun(int a,int n,float *f) /*/ int i,t=0 ;for(i=0;in;i+) *f=*f+ai;*f=*f/n;for(i=0;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;ik;i+) printf(%d ,ai); printf(n); count=fun(a,k,&aver); printf(aver is %f, count is %dn,aver,count); getch();#include #include double func(double x) /*/ double y; y=(exp(x)+sin(x-6)/(x*x+1); return y; /*/void main() clrscr(); printf(func(0.26) = %6.3lfn, func(0.26); printf(func(5.00) = %6.3lfn, func(5.00); printf(func(8.50) = %6.3lfn, func(8.50); getch();#include #include int find(int a,int n,float x) /*/ int i ,t; float min=fabs(x-a0); for(i=1;in;i+) if(fabs(x-ai)min) min=fabs(x-ai);t=ai; 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;in;i+) printf(%d ,ai); printf(n); k=find(a,n,x); printf(It is %dn,k); getch();#include #include double fun1(float x) /*/ double y; if(x3) y=sin(x); else if(x=3) y=x; else y=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)=%.2fn,x,y); getch();#include #include int fun(int bg,int fn) /*/ int i , j, t=0; for(i=bg;i=fn;i+) for(j=2;j=i/2) t+;return t; /*/void main() int count; count=fun(100,500); printf(nThe total of prime is %d,count); getch();#include #include double fun1(float x) /*/ double y; if(x3) y=pow(2.5+fabs(x),1.0/3)/(sin(x)+3); else y=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)=%.2fn,x,y); getch();#include 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)=%lfn,n,fun(n); getch(); #include #include double fun1(float x) /*/ double y; if(x10) y=sqrt(2.5+cos(x)/(x*sin(x)+3); else y=x*x; return y; /*/void main() float x; double y; clrscr(); printf(Please input a number:n); scanf(%