c语言程序设计60题答案

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1、(1)main(){charch;scanf("%c",&ch);if(ch>='A'&&ch<='Z')printf("1");elseif(ch>='a'&&ch<='z')printf("2");elseif(ch>='0'&&ch<='9')printf("3");elseprintf("4");}(2)#include"stdio.h"#include"conio.h"main(){inta,b;charch;printf("qingshurulianggeshuzihe+-*/%:");scanf("%d%

2、c%d",&a,&ch,&b);printf("%d%c%d=",a,ch,b);switch(ch){case'+':printf("%d",a+b);break;case'-':printf("%d",a-b);break;case'*':printf("%d",a*b);break;case'/':if(b!=0)printf("%d",a/b);elseprintf("error!");break;case'%':if(b!=0&&a>=b)printf("%d",a%b);elseprintf("error!")

3、;}}(3)#includemain(){floatx,n;inta;printf("qingshurugongzishu:");scanf("%f",&x);a=(int)(x/500);switch(a){case0:case1:n=0;break;case2:n=(x-1000)*0.05;break;case3:n=(x-1500)*0.05+500*0.05;break;case4:n=(x-2000)*0.15+500*0.1+500*0.05;break;default:n=(x-250

4、0)*0.2+500*0.15+500*0.1+500*0.05;break;}printf("yingjiaoshuishou:%f",n);}(4)#include"stdio.h"voidmain(){doublef=1;inti;for(i=1;i<=20;i++)f=f*i;printf("20!=%lf",f);}_（5）main(){inta[20]={1,1};inti;for(i=0;i<=17;i++)a[i+2]=a[i+1]+a[i];for(i=0;i<=19;i++){if(i%5==0)pri

5、ntf("");printf("%12d",a[i]);}}_#include"stdio.h"#include"math.h"intsushu(intx){inti;for(i=2;i<=sqrt(x);i++){if(x%i==0)return(0);}return(x);}（6）main(){inta,i,sushu();for(i=2;i<=1000;i++){a=sushu(i);9if(a!=0)printf("%3d",a);}}_（7）#includemain(){intj,t;for

6、(j=1;j<=30;j++)for(t=1;t<=90/4;t++)if(j*2+t*4==90&&j+t==30)printf("tuzishu=%djishu=%d",t,j);}（8）#includemain(){inti,j,wz=30,b=-1,s=1;for(i=1;i<=7;i++){for(j=1;j3)b=1;wz=wz+b;s=s+-b*2;}

7、}（9）#include"math.h"main(){ints;floatn,t,pi;t=1;pi=0;n=1.0;s=1;while(fabs(t)>1.0E-5){pi=pi+t;n=n+2;s=-s;t=s/n;}pi=pi*4;printf("pi=%10.6f",pi);}10#include"stdio.h"#include"conio.h"voidmain(){longx,a,b,i;intflaga,flagb;lp:printf("x=");scanf("%ld",&x);if(x%2

8、

9、x<0)g

10、otolp;for(a=3;a<=x/2;a++){flaga=1;for(i=2;i<=a/2;i++)if(a%2==0){flaga=0;break;}if(flaga==1){flagb=1;b=x-a;for(i=2;i<=a/2;i++)if(b%2==0){flagb=0;break;}}