《C语言程序设计》课后习题答案(第四版)谭浩强(共66页).docx

精选优质文档-倾情为你奉上1-5 #include <stdio.h>int main ( ) printf ("*nn"); printf(" Very Good!nn"); printf ("*n"); return 0;1-6#include <stdio.h>int main()int a,b,c,max; printf("please input a,b,c:n"); scanf("%d,%d,%d",&a,&b,&c); max=a; if (max<b) max=b; if (max<c) max=c; printf("The largest number is %dn",max); return 0;4-4-1#include <stdio.h>int main() int a,b,c; printf("请输入三个整数:"); scanf("%d,%d,%d",&a,&b,&c); if (a<b) if (b<c) printf("max=%dn",c); else printf("max=%dn",b); else if (a<c) printf("max=%dn",c); else printf("max=%dn",a); return 0;4-6.#include <stdio.h>int main() int x,y; printf("输入x:"); scanf("%d",&x); if(x<1) /* x<1 */ y=x; printf("x=%3d, y=x=%dn" ,x,y); else if(x<10) /* 1=<x<10 */ y=2*x-1; printf("x=%d, y=2*x-1=%dn",x,y);else /* x>=10 */ y=3*x-11; printf("x=%d, y=3*x-11=%dn",x,y); return 0;4-7-1#include <stdio.h>int main() int x,y; printf("enter x:"); scanf("%d",&x); y=-1; if(x!=0) if(x>0) y=1; else y=0; printf("x=%d,y=%dn",x,y); return 0;4-7-2#include <stdio.h>int main() int x,y; printf("please enter x:"); scanf("%d",&x); y=0; if(x>=0) if(x>0) y=1; else y=-1; printf("x=%d,y=%dn",x,y); return 0;4-8#include <stdio.h>int main() float score; char grade; printf("请输入学生成绩:"); scanf("%f",&score); while (score>100|score<0)printf("n 输入有误,请重输");scanf("%f",&score); switch(int)(score/10) case 10:case 9: grade='A'break;case 8: grade='B'break;case 7: grade='C'break;case 6: grade='D'break;case 5:case 4:case 3:case 2:case 1:case 0: grade='E' printf("成绩是 %5.1f,相应的等级是%cn ",score,grade);return 0;4-11#include <stdio.h>int main() int t,a,b,c,d; printf("请输入四个数:"); scanf("%d,%d,%d,%d",&a,&b,&c,&d); printf("a=%d,b=%d,c=%d,d=%dn",a,b,c,d); if (a>b) t=a;a=b;b=t; if (a>c) t=a;a=c;c=t; if (a>d) t=a;a=d;d=t; if (b>c) t=b;b=c;c=t; if (b>d) t=b;b=d;d=t; if (c>d) t=c;c=d;d=t; printf("排序结果如下: n"); printf("%d %d %d %d n" ,a,b,c,d); return 0; 4-12#include <stdio.h>int main() int h=10; float x1=2,y1=2,x2=-2,y2=2,x3=-2,y3=-2,x4=2,y4=-2,x,y,d1,d2,d3,d4; printf("请输入一个点(x,y):"); scanf("%f,%f",&x,&y); d1=(x-x4)*(x-x4)+(y-y4)*(y-y4); /*求该点到各中心点距离*/ d2=(x-x1)*(x-x1)+(y-y1)*(y-y1); d3=(x-x2)*(x-x2)+(y-y2)*(y-y2); d4=(x-x3)*(x-x3)+(y-y3)*(y-y3); if (d1>1 && d2>1 && d3>1 && d4>1) h=0; /*判断该点是否在塔外*/ printf("该点高度为 %dn",h); return 0; 5-3#include <stdio.h>int main() int p,r,n,m,temp; printf("请输入两个正整数n,m:"); scanf("%d,%d,",&n,&m); if (n<m) temp=n; n=m; m=temp; p=n*m; while(m!=0) r=n%m; n=m; m=r; printf("它们的最大公约数为:%dn",n); printf("它们的最小公约数为:%dn",p/n); return 0; 5-4#include <stdio.h>int main() char c; int letters=0,space=0,digit=0,other=0; printf("请输入一行字符:n"); while(c=getchar()!='n') if (c>='a' && c<='z' | c>='A' && c<='Z') letters+; else if (c=' ') space+; else if (c>='0' && c<='9') digit+; else other+; printf("字母数:%dn空格数:%dn数字数:%dn其它字符数:%dn",letters,space,digit,other); return 0; 5-5#include <stdio.h>int main() int a,n,i=1,sn=0,tn=0; printf("a,n=:"); scanf("%d,%d",&a,&n); while (i<=n) tn=tn+a; /*赋值后的tn为i个 a组成数的值*/ sn=sn+tn; /*赋值后的sn为多项式前i项之和*/ a=a*10; +i; printf("a+aa+aaa+.=%dn",sn); return 0; 5-6#include <stdio.h>int main() double s=0,t=1; int n; for (n=1;n<=20;n+) t=t*n; s=s+t; printf("1!+2!+.+20!=%22.15en",s); return 0;5-7#include <stdio.h>int main() int n1=100,n2=50,n3=10; double k,s1=0,s2=0,s3=0; for (k=1;k<=n1;k+) /*计算1到100的和*/ s1=s1+k; for (k=1;k<=n2;k+) /*计算1到50各数的平方和*/ s2=s2+k*k; for (k=1;k<=n3;k+) /*计算1到10的各倒数和*/ s3=s3+1/k; printf("sum=%15.6fn",s1+s2+s3); return 0; 5-8#include <stdio.h>int main() int i,j,k,n; printf("parcissus numbers are "); for (n=100;n<1000;n+) i=n/100; j=n/10-i*10; k=n%10; if (n=i*i*i + j*j*j + k*k*k) printf("%d ",n); printf("n"); return 0; 5-10#include <stdio.h> int main() int i,n=20; double a=2,b=1,s=0,t; for (i=1;i<=n;i+) s=s+a/b; t=a, a=a+b, b=t; printf("sum=%16.10fn",s); return 0; 5-11#include <stdio.h> int main() double sn=100,hn=sn/2; int n; for (n=2;n<=10;n+) sn=sn+2*hn; /*第n次落地时共经过的米数*/ hn=hn/2; /*第n次反跳高度*/ printf("第10次落地时共经过%f米n",sn); printf("第10次反弹%f米n",hn); return 0; 5-12#include <stdio.h> int main() int day,x1,x2; day=9; x2=1; while(day>0) x1=(x2+1)*2; /*第1天的桃子数是第2天桃子数加1后的2倍.*/ x2=x1; day-; printf("total=%dn",x1); return 0; 5-13#include <stdio.h> #include <math.h>int main() float a,x0,x1; printf("enter a positive number:"); scanf("%f",&a); x0=a/2; x1=(x0+a/x0)/2; do x0=x1; x1=(x0+a/x0)/2; while(fabs(x0-x1)>=1e-5); printf("The square root of %5.2f is %8.5fn",a,x1); return 0; 5-15#include <stdio.h> #include <math.h>int main() float x0,x1,x2,fx0,fx1,fx2; do printf("enter x1 & x2:"); scanf("%f,%f",&x1,&x2); fx1=x1*(2*x1-4)*x1+3)-6; fx2=x2*(2*x2-4)*x2+3)-6; while(fx1*fx2>0); do x0=(x1+x2)/2; fx0=x0*(2*x0-4)*x0+3)-6; if (fx0*fx1)<0) x2=x0; fx2=fx0; else x1=x0; fx1=fx0; while(fabs (fx0)>=1e-5); printf("x=%6.2fn",x0); return 0; 5-16#include <stdio.h> int main() int i,j,k; for (i=0;i<=3;i+) for (j=0;j<=2-i;j+) printf(" "); for (k=0;k<=2*i;k+) printf("*"); printf("n"); for (i=0;i<=2;i+) for (j=0;j<=i;j+) printf(" "); for (k=0;k<=4-2*i;k+) printf("*"); printf("n"); return 0; 6-1#include <stdio.h>#include <math.h>int main()int i,j,n,a101; for (i=1;i<=100;i+) ai=i; a1=0; for (i=2;i<sqrt(100);i+) for (j=i+1;j<=100;j+) if(ai!=0 && aj!=0) if (aj%ai=0) aj=0; printf("n"); for (i=2,n=0;i<=100;i+) if(ai!=0) printf("%5d",ai); n+; if(n=10) printf("n"); n=0; printf("n"); return 0;6-2#include <stdio.h>int main()int i,j,min,temp,a11; printf("enter data:n"); for (i=1;i<=10;i+) printf("a%d=",i); scanf("%d",&ai); printf("n"); printf("The orginal numbers:n"); for (i=1;i<=10;i+) printf("%5d",ai); printf("n"); for (i=1;i<=9;i+) min=i; for (j=i+1;j<=10;j+)if (amin>aj) min=j; temp=ai; ai=amin; amin=temp; printf("nThe sorted numbers:n"); for (i=1;i<=10;i+) printf("%5d",ai); printf("n"); return 0; 6-3#include <stdio.h>int main()int a33,sum=0;int i,j; printf("enter data:n"); for (i=0;i<3;i+) for (j=0;j<3;j+) scanf("%3d",&aij); for (i=0;i<3;i+) sum=sum+aii; printf("sum=%6dn",sum); return 0;6-4#include <stdio.h>int main() int a11=1,4,6,9,13,16,19,28,40,100; int temp1,temp2,number,end,i,j; printf("array a:n"); for (i=0;i<10;i+) printf("%5d",ai); printf("n"); printf("insert data:"); scanf("%d",&number); end=a9; if (number>end) a10=number; else for (i=0;i<10;i+) if (ai>number) temp1=ai;ai=number;for (j=i+1;j<11;j+) temp2=aj; aj=temp1; temp1=temp2; break; printf("Now array a:n"); for (i=0;i<11;i+) printf("%5d",ai); printf("n"); return 0; 6-5#include <stdio.h>#define N 5int main() int aN,i,temp; printf("enter array a:n"); for (i=0;i<N;i+) scanf("%d",&ai); printf("array a:n"); for (i=0;i<N;i+) printf("%4d",ai); for (i=0;i<N/2;i+) /循环的作用是将对称的元素的值互换 temp=ai; ai=aN-i-1; aN-i-1=temp; printf("nNow,array a:n"); for (i=0;i<N;i+) printf("%4d",ai); printf("n"); return 0; 6-6#include <stdio.h>#define N 10int main() int i,j,aNN; for (i=0;i<N;i+) aii=1; ai0=1; for (i=2;i<N;i+) for (j=1;j<=i-1;j+) aij=ai-1j-1+ai-1j; for (i=0;i<N;i+) for (j=0;j<=i;j+) printf("%6d",aij); printf("n"); printf("n"); return 0;6-7#include <stdio.h>int main() int a1515,i,j,k,p,n; p=1; while(p=1) printf("enter n(n=1-15):"); scanf("%d",&n); if (n!=0) && (n<=15) && (n%2!=0) p=0; for (i=1;i<=n;i+) for (j=1;j<=n;j+) aij=0; j=n/2+1; a1j=1; for (k=2;k<=n*n;k+) i=i-1; j=j+1; if (i<1) && (j>n) i=i+2; j=j-1; else if (i<1) i=n; if (j>n) j=1; if (aij=0) aij=k; else i=i+2; j=j-1; aij=k; for (i=1;i<=n;i+) for (j=1;j<=n;j+) printf("%5d",aij); printf("n"); return 0; 6-8#include <stdio.h>#define N 4#define M 5 /* 数组为4行5列 */int main() int i,j,k,aNM,max,maxj,flag; printf("please input matrix:n"); for (i=0;i<N;i+) /* 输入数组 */ for (j=0;j<M;j+) scanf("%d",&aij); for (i=0;i<N;i+) max=ai0; /* 开始时假设ai0最大 */ maxj=0; /* 将列号0赋给maxj保存 */ for (j=0;j<M;j+) /* 找出第i行中的最大数 */ if (aij>max) max=aij; /* 将本行的最大数存放在max中 */ maxj=j; /* 将最大数所在的列号存放在maxj中 */ flag=1; /* 先假设是鞍点，以flag为1代表 */ for (k=0;k<N;k+) if (max>akmaxj) /* 将最大数和其同列元素相比 */ flag=0; /* 如果max不是同列最小，表示不是鞍点令flag1为0 */ continue; if(flag) /* 如果flag1为1表示是鞍点 */printf("a%d%d=%dn",i,maxj,max); /* 输出鞍点的值和所在行列号 */ break; if(!flag) /* 如果flag为0表示鞍点不存在 */ printf("It is not exist!n"); return 0; 6-9#include <stdio.h>#define N 15int main() int i,number,top,bott,mid,loca,aN,flag=1,sign; char c; printf("enter data:n"); scanf("%d",&a0); i=1; while(i<N) scanf("%d",&ai); if (ai>=ai-1) i+; else printf("enter this data again:n"); printf("n"); for (i=0;i<N;i+) printf("%5d",ai); printf("n"); while(flag) printf("input number to look for:"); scanf("%d",&number); sign=0; top=0; /top是查找区间的起始位置 bott=N-1; /bott是查找区间的最末位置 if (number<a0)|(number>aN-1) /要查的数不在查找区间内 loca=-1; / 表示找不到 while (!sign) && (top<=bott) mid=(bott+top)/2; if (number=amid) loca=mid; printf("Has found %d, its position is %dn",number,loca+1); sign=1; else if (number<amid) bott=mid-1; else top=mid+1; if(!sign|loca=-1) printf("cannot find %d.n",number); printf("continu or not(Y/N)?"); scanf(" %c",&c); if (c='N'|c='n') flag=0; return 0; 6-10#include <stdio.h>int main() int i,j,upp,low,dig,spa,oth; char text380; upp=low=dig=spa=oth=0; for (i=0;i<3;i+) printf("please input line %d:n",i+1); gets(texti); for (j=0;j<80 && textij!='0'j+) if (textij>='A'&& textij<='Z') upp+; else if (textij>='a' && textij<='z') low+; else if (textij>='0' && textij<='9') dig+; else if (textij=' ') spa+; else oth+; printf("nupper case: %dn",upp); printf("lower case: %dn",low); printf("digit : %dn",dig); printf("space : %dn",spa); printf("other : %dn",oth); return 0;6-12a-c#include <stdio.h>int main() int j,n; char ch80,tran80; printf("input cipher code:"); gets(ch); printf("ncipher code :%s",ch); j=0; while (chj!='0') if (chj>='A') && (chj<='Z') tranj=155-chj; else if (chj>='a') && (chj<='z') tranj=219-chj; else tranj=chj; j+; n=j; printf("noriginal text:"); for (j=0;j<n;j+) putchar(tranj); printf("n"); return 0; 6-12b#include <stdio.h>int main() int j,n; char ch80; printf("input cipher code:n"); gets(ch); printf("ncipher code:%sn",ch); j=0; while (chj!='0') if (chj>='A') && (chj<='Z') chj=155-chj; else if (chj>='a') && (chj<='z') chj=219-chj; else chj=chj; j+; n=j; printf("original text:"); for (j=0;j<n;j+) putchar(chj); printf("n"); return 0; 6-13#include <stdio.h>int main() char s180,s240; int i=0,j=0; printf("input string1:"); scanf("%s",s1); printf("input string2:"); scanf("%s",s2); while (s1i!='0') i+; while(s2j!='0') s1i+=s2j+; s1i='0' printf("nThe new string is:%sn",s1); return 0; 7-1-1#include <stdio.h>int main() int hcf(int,int); int lcd(int,int,int); int u,v,h,l; scanf("%d,%d",&u,&v); h=hcf(u,v); printf("H.C.F=%dn",h); l=lcd(u,v,h); printf("L.C.D=%dn",l); return 0; int hcf(int u,int v)int t,r; if (v>u) t=u;u=v;v=t; while (r=u%v)!=0) u=v; v=r; return(v);int lcd(int u,int v,int h) return(u*v/h); 7-3#include <stdio.h>int main() int prime(int); int n; printf("input an integer:"); scanf("%d",&n); if (prime(n) printf("%d is a prime.n",n); else printf("%d is not a prime.n",n); return 0; int prime(int n) int flag=1,i; for (i=2;i<n/2 && flag=1;i+) if (n%i=0)