二级C语言练习习题(附答案).doc

1.输入三角形三边长，求三角形面积。#include“math.h”#includestdio.hvoid main()float a,b,c,s,area;scanf(“%f,%f,%f”,&a,&b,&c);s=1.0/2*(a+b+c);area=sqrt(s*(s-a)*(s-b)*(s-c);printf(“area=%f”,area);2.已知圆半径，圆柱高，求圆周长，圆柱体积。#includestdio.hvoid main()float r,h,l,v,pi;pi=3.1415926;scanf(“%f,%f”,&r,&h);l=2*pi*r;v=pi*r*r*h;printf(“圆周长为：%6.2fn”,l);printf(“圆柱体积为：%6.2f”,v);3. 求6！#includevoid main() int i,sum; i=1;sum=1; while(i=6) sum=sum*i; i+; printf(sum=%dn,sum);4. 用/41-1/3+1/5-1/7+公式求的近似值，直到最后一项的绝对值小于10-6为止。#include#includevoid main()int s;float n，t，Pi;t=1；Pi=0;n=1.0;S=1;while(fabs(t)1e-6)Pi=Pi+t;n=n+2;s=-s;t=S/n;Pi=Pi*4;printf(Pi=%10.6fn，Pi);5. 判断m是否素数。#include #includevoid main()int m，i，k;scanf(%d，&m);k=sqrt(m); for (i=2;i=k+1) printf(%d is a Prime mubern，m); else printf(%d is not a Prime numbern，m); 6. 整型数组a中有若干个元素，再读入一个待删除的整数x，删除数组中第一个等于x的元素，如果x不是数组中的元素，则显示：can not delete x!。#include int main( )int a5=23,45,34,12,56;int i,j,x;printf(Please input x be deleted:n);scanf(%d,&x); for (i=0;i5&ai!=x;i+) ; if (i=5) printf(can not delete x!n);for (i=0;i5;i+) printf(%5d,ai);elsefor (j=i;j5;j+) aj=aj+1;printf(The new array is:n);for (i=0;i4;i+) printf(%5d,ai);printf(n);return 0;7.从键盘上输入n(1n10)个整数，首先输出这些元素，再用选择法排序，最后输出排序后的元素。#include int main()int a10,n,index,i,k,temp; do printf(Please input n(1=n=10):n);scanf(%d,&n);while (n10); printf(Please input %d elements:n,n);for (i=0;in;i+) scanf(%d,&ai); printf(The original array is:n);for (i=0;in;i+) printf(%5d,ai);printf(n);for (k=0;kn-1;k+) index=k ; for (i=k+1;in;i+) if (aiaindex) index=i;if (index!=k) temp=aindex; aindex=ak;ak=temp; printf(The sorted array is:n);for (i=0;in;i+) printf(%5d,ai);printf(n);return 0;8.将打印18个*组成星形线定义为一个返回值和形参列表都为空的函数，通过主函数调用它。#includevoid Star(void) int i;for(i=1;i=18;i+)printf(*);printf(n);return ; int main()Star( );printf(I love C language!n);Star( );return 0;9. 调用prime 函数以每行5个素数的格式输出100到200之间的所有素数。#include#includeint prime(int m) int i,k,f=1 ; if (m=1)f=0 ; k=(int)sqrt(m); for (i=2; i=k;i+) if (m%i=0) f=0 ; return f ; int main( )int i,count=0;for (i=101;i200;i=i+2) if (prime(i) printf(%5d,i); count+ ; if (count%5=0 ) printf(n);return 0;10. 选择法排序函数的定义与调用。(假设共10个元素)#include void Selection(int *pa,int n);int main()int a10, i; for (i=0;i10;i+) scanf(%d,&ai); printf(The original array is:n);for (i=0;i10;i+) printf(%5d,ai);printf(n);Selection(a,10);printf(The sorted array is:n);for (i=0;i10;i+) printf(%5d,ai);printf(n);return 0;void Selection(int *pa,int n) int i,k,index,temp; for (k=0;kn-1;k+) index=k ; for(i=k+1;in;i+) if (paipaindex) index=i;if (index!=k) temp=paindex;paindex=pak;pak=temp;11.将如下所示的矩阵存入二维数组，然后照原样输出，最后按转置形式输出0 1 25 6 710 11 1215 16 17#includeint main( )int a43=0; int r,c; for (r=0;r4;r+)for (c=0;c3;c+)arc=5*r+c; printf(the original matrix is:n); for (r=0;r4;r+) for (c=0;c3;c+) printf(%dt,arc); printf(n); printf(the transposed matrix is:n);for(c=0;c3;c+)for(r=0;r4;r+)printf(%dt,arc); printf(n); return 0;12.键盘输入一段文本，存储到文本文件D:poem.txt中。#include#includeint main()char ch;FILE *fp; fp=fopen(D:poem.txt,w); if(!fp)printf(file cannot be opened); exit(1);printf(Enter a text (to end with #):n); ch=getchar(); while(ch!=#) fputc(ch,fp); ch=getchar(); fclose(fp);return 0;13.从文件D:poem.txt读出文本，在显示器上输出。#include#includeint main( )char ch;FILE *fp; fp=fopen(D:poem.txt,r); if(!fp) printf(file cannot be opened); exit(1);while(ch=fgetc(fp)!=EOF) putchar(ch); fclose(fp);return 0;14. 从文件D:poem.txt逐行读入文本，在显示器上输出。