大学C语言课本课后习题相应答案及详细解答.doc

5-1 #includestdio.hvoid main()char c1,c2;printf(c1:);c1=getchar();if(c1=a&c1=A&c1%cn,c2);5-2#includestdio.hvoid main()char c;printf(c:);c=getchar();if(c=A&c=0&s0&d0&d0&d0&dc&b+ca&a+cb)if(ab)t=a;a=b;b=t;if(ac)t=a;a=c;c=t;if(bc)t=b;b=c;c=t;if(a=b&b=c) printf(等边三角形.);else if(a=b|b=c|a=c) printf(等腰角形.);else if(c*c=a*a+b*b) printf(直角三角形.);else printf(任意三角形.); printf(n);else printf(不能构成三角形！n);6-1#includestdio.hvoid main()int a,b,m,n,k;printf(m,n:);scanf(%d,%d,&m,&n); a=m;b=n;k=a%b;while(k)a=b;b=k;k=a%b;printf(%dn,(m*n/b);6-2#includestdio.hvoid main()int n;int i,j,s;printf(n=);scanf(%d,&n);for(i=1;i=n;i+) s=0; for(j=1;ji;j+) if(i%j=0) s=s+j; if(s=i) printf(%d:,i); for(j=1;ji;j+) if(i%j=0) printf(%d ,j); printf(n); 6-3#includestdio.h#includemath.hvoid main()double x,y,zd,zx,x1,x2;zd=zx=50;for(x=0;xzd) zd=y;x1=x; if(yzx) zx=y;x2=x;printf(x=%f,max=%fn,x1,zd);printf(x=%f,min=%fn,x2,zx);6-4#includestdio.hvoid main()double x,sum=0,a,b,c;int i;printf(x=);scanf(%lf,&x);a=x;b=1.0;c=1.0;for(i=1;i=10;i+) sum=sum+a/(b*c); a=a*x*x; b=b+2; c=c*i;printf(y(%.2lf)=%lfn,x,sum);7-1/*选择排序*/#includestdio.hvoid main()int i,j,n,k,temp;int a10;printf(n(10):);scanf(%d,&n);printf(Original:);for(i=0;in;i+) scanf(%d,&ai);for(i=0;in-1;i+) /*趟*/ k=i; for(j=i+1;jn;j+) /*比较次数*/ if(ajak) k=j;/*?*/if(k!=i) temp=ai; ai=ak; ak=temp; printf(Ordered:);for(i=0;in;i+) printf(%d ,ai);printf(n);7-2#includestdio.hvoid main()int a33;int i,j,s=1;printf(Input:n);for(i=0;i3;i+)for(j=0;j3;j+)scanf(%d,&aij);if(i=j) s=s*aij;printf(s=%dn,s); 7-3/*杨辉三角*/#includestdio.hvoid main()int x77;int i,j;for(i=0;i7;i+) xi0=1;xii=1;for(i=2;i7;i+)for(j=1;ji;j+)xij=xi-1j+xi-1j-1;for(i=0;i7;i+)for(j=0;j=i;j+)printf(%3d,xij);printf(n);7-4#include#includevoid main()char str21;int i,j;printf(str:);gets(str);for(i=0,j=strlen(str)-1;ij) printf(%s是回文n,str);else printf(%s不是回文n,str);7-5/*输入一维数组的10个元素，并将最小值与第1个数交换，最大值与最后一个数交换，然后输出交换后的结果*/#includevoid main()int a10,i,zx,zd; printf(Input:n);zx=zd=0;for(i=0;i10;i+)scanf(%d,&ai);if(aiazd) zd=i;if(zx!=0) int t; t=a0; a0=azx; azx=t;if(zd!=9)int t;t=a9;a9=azd;azd=t;for(i=0;i10;i+)printf(%d ,ai);printf(n);8-2#includestdio.hdouble xexp(double x,int n)double c;if(n=0) c=1.0;else c=x*xexp(x,n-1);return c;void main()int n;double x; printf(x:);scanf(%lf,&x);printf(n:);scanf(%d,&n);printf(Result=%gn,xexp(x,n);8-3#includestdio.hint find(int x,int n,int y)int i,pos=-1;for(i=0;in;i+)if(xi=y) pos=i;return pos;void main()int a10=11,1,13,15,18,7,19,27,3,8;int i,y,pos; for(i=0;i10;i+) printf(%d ,ai); printf(ny:);scanf(%d,&y);pos=find(a,10,y);if(pos=-1) printf(Not found!n);else printf(Position=%dn,pos);8-1#includestdio.h #includeconio.h /getch()#includestdlib.h /srand(),rand(),system(cls)#includetime.h /time()void main()void init(int a5,int m,int n);void input(int a5,int m,int n); void output(int a5,int m,int n);int min(int b5,int m,int n);int a55,ch=0;while(1) system(cls); /清屏 printf(1.初始化 2.键盘输入 0.结束程序:); ch=getch(); /头文件conio.h printf(n); if(ch=0) break; else if(ch=1) init(a,5,5); output(a,5,5); else if(ch=2) input(a,5,5); output(a,5,5); else printf(Error!n); printf(Min element:%dn,min(a,5,5); printf(按任意键继续！n); getch();void init(int a5,int m,int n)int i,j;srand(time(0); /time(0)表示以当前的时间做种子,增加每次运行的随机性for(i=0;i5;i+)for(j=0;j5;j+)aij=rand()%100; /随机数范围:032767,将它控制在099的范围void input(int a5,int m,int n)int i,j;printf(Input Array 5X5:n);for(i=0;im;i+)for(j=0;jn;j+)scanf(%d,&aij);void output(int a5,int m,int n)int i,j;printf(Output Array 5X5:n);for(i=0;i5;i+)for(j=0;j5;j+)printf(%2d ,aij);printf(n);int min(int b5,int m,int n)int i,j,zx;zx=b00;for(i=0;im;i+)for(j=0;jn;j+)if(i=j&bijzx) zx=bij;return zx;8-4#includestdio.hfloat pave,nave;void saver(float a,int n)int i,z,f;float psum,nsum;psum=nsum=0.0;z=f=0;for(i=0;in;i+)if(ai0) psum=psum+ai;f+; else continue;pave=(z!=0?psum/z:0.0);nave=(f!=0?nsum/f:0.0);void main()float a10=1.0,11.0,3.0,-1.5,-5.5,-2; saver(a,10);printf(pave=%.1f,nave=%.2fn,pave,nave);8-5#includestdio.h#includemath.hvoid p1(int a,int b) printf(has two equal roots:%8.4fn,-b/(2*a);void p2(int a,int b, int disc)float x1,x2;x1=(-b+sqrt(disc)/(2*a);x2=(-b-sqrt(disc)/(2*a);printf(Has distant real roots:%8.4f and %8.4fn,x1,x2);void p3(int a,int b, int disc)float real,image;real=-b/(2*a);image=sqrt(-disc)/(2*a);printf(Has complex roots:n);printf(%8.4f+%8.4fin,real,image);printf(%8.4f-%8.4fin,real,image);void main() int a,b,c,disc;printf(a,b,c:);scanf(%d,%d,%d,&a,&b,&c); disc=b*b-4*a*c;if(fabs(disc)1e-6) p2(a,b,disc);else p3(a,b,disc);8-6#includestdio.h#includestdlib.h#includeconio.h#includetime.hvoid main()void printaverage(int score5,int m,int n); void printname(int score5,int m,int n);int score105;int i,j;srand(time(0);for(i=0;i10;i+)for(j=0;j5;j+)scoreij=50+rand()%50+1;printf(Output Students score:n);printf(Course 1 2 3 4 5n);printf(-n);for(i=0;i10;i+)printf(No.%2d:,i+1);for(j=0;j5;j+)printf(%3d ,scoreij);printf(n);printaverage(score,10,5);printname(score,10,5);void printaverage(int score5,int m,int n)int i,j,sum;printf(nAverage score:n);f