while循环结构例题.doc

引子#include""main(){inti=1;for(i=1;i<=10000;i++)printf(“%d\t”,i);}题型1输入输出多个数据eg1、输出1~10000之间所有的整数#include""main(){inti=1;while(i<=1000){printf(“%d\t”,i);i++;}}拓展:1、换成所有的奇数2、、求1+2+3+4+………+100的值#include""main(){inti=1,s=0;while(i<=100){s=s+i;i++;}printf(“%d\n”,s);}拓展:1、求1+2+3+4+………+n的值2、求12+22+32+………+n2的值3、求1+1/2+1/3+………+1/、求n!的值#include""main(){inti=1,n,p=1;scanf(“%d”,&n);while(i<=n){p=p*i;i++;}printf(“%d\n”,p);}拓展:求1!+2!+3!+………+n!的值#include""main(){inti=1,n,p=1,s;scanf(“%d”,&n);while(i<=n){p=p*i;s=s+p;i++;}printf(“%d\n”,s);}题型3无限个数连加eg3、求1-1/3+1/5-1/7+………的近似值,要求精度要达到10-4#include""#include""main(){floatn=1,s=0,f=1,t=1;while(fabs(t)>=1e-4){t=f/(2*n-1);s=s+t;f=-f;n++;}printf(“%f\n”,s);}拓展:求1-1/2+1/4-1/6+………的近似值,要求精度要达到10-、输入20个数,统计其中正数、负数和零的个数。#include""main(){inti=1,n,p,z;floatx;p=n=z=0;while(i<=20){scanf(“%f”,&x);if(x>0)p++;elseif(x<0)n++;elsez++;i++;}printf(“%d\t%d\t%d\n”,p,n,z);}拓展:?方法1#include""main(){longi=10000,c=0;while(i<=99999){if((i%3==0)&&(i%10==6))c++;i++;}printf(“%d\n”,c);}方法2#include""main(){longi=10006,c=0;while(i<=99999){if(i%3==0)c++;i=i+10;}printf(“%d\n”,c);}题型5数列eg5输出fibo数列的第20位数字#include""main(){intf1=1,f2=1,f3,i=3;while(i<=20){f3=f1+f2;f1=f2;f2=f3;i++;}printf(“%d\n”,f3);}拓展:输出fibo数列前20位数字#include""main(){intf1=1,f2=1,f3,i=3;printf(“%d\t%d\t”,f1,f2);while(i<=20){f3=f1+f2;f1=f2;f2=f3;printf(“%d\t”,f3);i++;}}题型6数据的逆序输出eg6任意给定一个正整数,个位数字逆序输出。#include""main(){longx,t;scanf(“%ld”,&x);while(x!=0){t=x%10;x=x/10;printf(“%d”,t);}}题型7公约数与公倍数eg7任意输入两个正整数,求其最大公约数和最小公倍数。#include""main(){intm,n,a,b,r,t;scanf(“%d%d”,&m,&n);if(m>n){a=m;b=n;}else{a=n;b=m;}while(b!=0){r=a%b;a=b;b=r;}printf(“zuidagongyushushi:%d\n”,a);printf(“zuixiaogongbeishushi:%d\n”,m*n/a);}题型8素数问题eg8从键盘上任意输入一个正整数,判断其是否为素数。#include""main(){intx,i=2;scanf(“%d”,&x);while(x%i!=0)i++;if(x==i)printf(“shi!”);elseprintf(“fou!”);}题型