C語言上機練習題及答案

1、1輸入三個整數(shù)x,y,z,把這三個數(shù)由小到大輸出。# include<stdio.h>voidmain()intx,y,z,a;scanf("%d,%d,%d",&x,&y,&z);if(x>y)a=x;x=y;y=a;if(x>z)a=x;x=z;z=a;if(y>z)a=y;y=z;z=a;printf("%d,%d,%dn",x,y,z);田2輸入圓的半徑，輸出圓的周長和面積。# include<stdio.h># definePI3.1415926# defineS=PI*r*r#

2、 defineV(4.0/3)*PI*r*r*rvoidmain()doubler;printf("pleaseinputr:");scanf("%lf",&r);printf("areais%.4lfn",S);printf("volumeis%.4lfn",V);輸入正方形的邊長，輸出正方形的周長和面積。# include<stdio.h>voidmain()floatc,zc,mj;printf("輸入你的正方形");scanf("%fn",&

3、;c);zc=4*c;mj=c*c;printf("周長f,面積f,邊長f",zc,mj,c);3用格式輸入函數(shù)輸入3個字符，并用輸出函數(shù)反向輸出3個字符和他們的ASCII碼。# include<stdio.h>intmain()char-ch1,ch2,ch3;printf("pleaseinputthreecharacters:n");scanf("%C%C%c",&ch1,&ch2,&ch3);printf("%cn%dn",ch3,ch3);printf("%c

4、n%dn",ch2,ch2);printf("%cn%dn",ch1,ch1);f=9/5*c+32。輸入一個攝氏溫度，要求輸出華氏溫度。公式為# include<stdio.h>voidmain()floatC,F;scanf("%f",&F);C=5.0/9*(F-32);printf("%8.2f",C);4。比較兩個數(shù)大小的題#include<stdio.h>voidmain()inta,b;scanf("%d,%d",&a,&b);if(a>

5、b)printf("%dn",a);elseprintf("%dn",b);第二題：此題作廢(千萬不要用)#include<stdio.h>voidmain()chara,b,c;scanf("%c,%c,%c",&a,&b,&c);while(a<97|a>122)|(b<97|b>122)|(c<97|c>122)；printf("您輸入非三個小寫字母，請重新輸入：n");scanf("%c,%c,%c",&a,

6、&b,&c);printf("%c,%c,%cn",a-32,b-32,c-32);5輸入任意10個數(shù)，求他們的平均值。#include<stdio.h>voidmain()Printf("請輸入10個整數(shù)：");inta10,k=0,sum=0;for(inti=0;i<10;+i);i>ai;if10>=ai>0+k;sum=sum+ai;floatave=sum/10.0printf("平均值為：%fn",ave);6 實現(xiàn)從鍵盤輸入兩個整數(shù)，按從小到大次序輸出這兩個數(shù)。#in

7、clude<stdio.h>voidmain()inta,b,tem;printf("inputtwonumbers:n");scanf("%d,%d",&a,&b);if(a>b)tem=a;a=b;b=tem;printf("%d,%d",a,b);7 從鍵盤輸入三個整數(shù)，輸出最大的那個數(shù)。#include<stdio.h>voidmain()inta,b,c,max;printf("請輸入三個整數(shù)：n");scanf("%d%d%d",&

8、;a,&b,&c);max=a>b?a:b;max=max>c?max:c;printf(“max=%dn”,max);8 輸入任意一個三位數(shù)，將其各位數(shù)字反序輸出(例如輸入123，輸出321)。#include<stdio.h>voidmain()intx,y,z,n;printf("pleaseinputanintegerlessthan1000n");scanf("%d",&n);x=n/100;n=n-100*x;y=n/10;z=n-10*y;if(x>0)printf("%d%d

9、%dn",z,y,x);elseif(y>0)printf("%d%dn",z,y);elseprintf("%dn",z);9 輸入三角形的邊長，求三角形面積。(面積=sqrt(s(s-a)(s-b)(s-c),s=(a+b+c)/2)。#include<stdio.h>voidmain()floata,b,c,s,area;intok=0;printf("inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);a+b>c?ok+

10、:0;a+c>b?ok+:0;b+c>a?ok+:0;ok=3(s=1/2*(a+c+b);area=sqrt(s*(s-a)*(s-b)*(s-c);printf("s=%fn,area=%fn",s,area);10輸入2個數(shù)，比較其大小，將較大的數(shù)輸出。#include<stdio.h>voidmain()inta,b,c,max,min;printf(“Inputa=”);scanf(“%d”,&a);printf(“Inputb=”);scanf(“%d”,&b);If(a>b)printf(“較大的數(shù)是%dn”,a)

11、;elseprintf(“較大的數(shù)是%dn”,b);11輸入任意三個整數(shù)，求它們的和及平均值。#include“stdio.h"voidmain()inta,b,c,sum;floatave;scanf("%d%d%d",&a,&b,&c);sum=a+b+c;ave=(a+b+c)/3.0;printf("三個數(shù)的和為：%dn",sum);printf("三個數(shù)的平均值為：%fn",ave);12求解方程ax2+bx+c=0的實數(shù)根。a,b,c由鍵盤輸入，aw0且b2-4ac>0。#inclu

12、de<stdio.h>#include<math.h>voidmain()floata,b,c,x1,x2;printf("請輸入a,b,c的值：");scanf("%f%f%f",&a,&b,&c);if(b*b-4*a*c<=0)printf("輸入的系數(shù)不對，b2-4ac不大于0！程序退出！n");elsex1=(-b+sqrt(b*b-4*a*c)/2*a;x2=(-b-sqrt(b*b-4*a*c)/2*a;printf("x1=%.2fn",x1);

13、printf("x2=%.2fn",x2);13 寫一個程序，輸入一個班學生的成績，求全班的平均成績。#include<iostream>usingnamespacestd;voidfailnum(intscore,intnum)intn=0;for(inti=0;i<num;i+)if(scorei<60)n+;cout<<"不及格人數(shù)："<<n<<endl;voidaverage_num(intscore,intnum)intsum=0,number=0;floatn=0;for(inti=

14、0;i<num;i+)sum=sum+scorei;n=(sum*1.0)/num;for(i=0;i<num;i+)if(scorei>=n)number+;cout<<"平均分為："<<n<<endl;cout<<"成績在全班平均分及平均分之上的學生人數(shù):"<<number<<endl;voidstastics(intscore,intnum)intn1=0,n2=0,n3=0,n4=0,n5=0;for(inti=0;i<num;i+)if(scorei

15、<60)n1+;elseif(scorei<=69)n2+;elseif(scorei<=79)n3+;elseif(scorei<=89)n4+;if(scorei>=90)n5+;cout<<"分數(shù)在60以下占："<<(n1*1.0)/num)*100<<"%"<<endl;cout<<"分數(shù)在60-69占："<<(n2*1.0)/num)*100<<"%"<<endl;cout<

16、<"分數(shù)在70-79占："<<(n3*1.0)/num)*100<<"%"<<endl;cout<<"分數(shù)在80-89占："<<(n4*1.0)/num)*100<<"%"<<endl;cout<<"分數(shù)在90以上占："<<(n5*1.0)/num)*100<<"%"<<endl;intmain()intscore35,num;cout&l

17、t;<"輸入全班總?cè)藬?shù)："cin>>num;cout<<"輸入內(nèi)容(每個數(shù)不超出0-100)，用空格分開："<<endl;for(inti=0;i<num;i+)cin>>scorei;failnum(score,num);average_num(score,num);stastics(score,num);return0;14 編寫程序輸出如下圖形：(沒有的！)* * *從鍵盤輸入一個整數(shù)判斷是否為素數(shù)。#include"stdio.h"voidmain()inti,n;p

18、rintf("pleaseinputapositivenumber:");scanf("%d",&n);for(i=2;i<=n-1;i+)if(n%i=0)break;if(i<=n-1)printf("%d不是素數(shù)n",n);elseprintf("%d不是素數(shù)n",n);15輸入一個三位數(shù)，判斷是否是一個“水仙花數(shù)”，水仙花數(shù)是指3位數(shù)的各位數(shù)字的立方和等于這個三位數(shù)本身。例如153=1*1*1+5*5*5+3*3*3。#include<stdio.h>voidmain()in

19、tx,a,b,c;scanf("%d",x);a=x/100;b=(x/10)%10;c=x%10;if(x=a*a*a+b*b*b+c*c*c)printf("YES");elseprintf("NOT");16輸入年號，判斷它是否為閏年。#include<stdio.h>voidmain()inty;scanf("%d",&y);if(y%400=0|y%4=0&&y%100!=0)printf("Yes.n");elseprintf("No.n

20、");17用for循環(huán)語句求n!用遞歸法求n!#include<stido.h>intfac(intn);voidmain()(intn;printf("pleaseinputn(n>=0):");scanf("%d",&n);printf("%d!=%dn",n,fac(n);)intfac(intn)intt;if(n=0|n=1)t=1；elset=n*fac(n-1);elsereturn(t);18用函數(shù)實現(xiàn)求最大公約數(shù)的程序#include<stdio.h>intgcd(in

21、ta,intb);voidmain()inta,b,m;printf("pleaseinputa,b:");scanf("%d,%d",&a,&b);m=gcd(a,b);printf("gcd(%d,%d尸dn",a,b,m);intgcd(inta,intb)inttdot=a%d;a=b;b=t;while(b!=0);return(a);19用函數(shù)實現(xiàn)求最小公倍數(shù)的程序#include<stdio.h>intgcd(inta,intb);intlcm(inta,intb);voidmain()int

22、a,b,m,n;printf("pleaseinputa,b:");scanf("%d,%d",&a,&b);m=gcd(a,b);n=lcm(a,b);printf("gcd(%d,%d)=%dn",a,b,m);printf("lcm(%d,%d)=%dn",a,b,n);intgcd(inta,intb)inttdot=a%d;a=b;b=t;while(b!=0);return(a);intlcm(inta,intb)intt;t=a*b/gcd(a,b);return(t);20編寫判斷水仙花的函數(shù)，從主函數(shù)輸入一個三位正整數(shù)N，在主函數(shù)中調(diào)用判斷水仙花數(shù)的函數(shù)，求出三位數(shù)中所有的水仙花數(shù)。水仙花數(shù)是指3位數(shù)的各位數(shù)字的立方和等于這個三位數(shù)本身。例如153=1*1*1+5*5*5+3*3*3。#include<stdio.h>voidf(m)intx,y,z;x=m/100;y=m/10%10;z=m%10;if(m=x*x*x+y*y*y+z*z*z)printf("%d是水仙花數(shù)n",m);elseprintf("%d不是水仙花數(shù)n",m);voidmain()intn;scanf("%