c语言编程入门例题.doc

《c语言编程入门例题.doc》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、回文数（逆序数）main(){longx,y=0,t;scanf(“%ld”,&x);t=x;while(x!=0){y=y*10+x%10;x=x/10;}if(t==y)printf(“yes”);elseprintf(“no”);}#include#includemain(){floats=0,t=1;intf=1,k=1;while(fabs(t)>=1e-6){/*1通项加到s上*/s+=t;/*2调整通项*/f=-f;k=k+2;t=1.0*f/k;}printf(“s=%f”,4*s);}P77eg5.2main()

2、{floatsum=0,t=1;intf=1,k=0;while(fabs(t)>1e-4){sum=sum+t;f=-f;k=k+1;t=1.0*f/k/(k+1);}printf(“sum=%f”,sum);}穷举法main(){intx,g,s,b,n=0;x=100;while(x<=999){g=x%10;s=x/10%10;b=x/100;if(g*g*g+s*s*s+b*b*b==x){printf(“%5d”,x);n++;if(n%5==0)printf(“”);}x++;}}素数main(){intx,i,flag=1;scanf(“%d”

3、,&x);for(i=2;i<=x/2;i++)if(x%i==0)flag=0;if(flag)printf(“yes”);/*if(flag==1)*/elseprintf(“no”);}[a,b]所有素数main(){inta,b,flag=1,x,n=0;scanf(“%d%d”,&a,&b);if(a<2

4、

5、b<2)printf(“error”);else{if(a>b){x=a;a=b;b=x;}for(x=a;x<=b;++x){flag=1;for(i=2;i<=x/2;i++)if(x%i==0)flag=0;if(flag){printf(“%

6、d“,x);n++;if(n%6==0)printf(“”);}}}}九九乘法表main(){inti,j;for(i=1;i<=9;i++)/*行*/{for(j=1;j<=9;j++)/*列*/printf(“%d*%d=%2d“,i,j,i*j);printf(“”);}}