北工大c语言题库.doc

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1、求1+1/2!+....+1/n!#include"stdio.h"intmain(){intri,repeat;inti,n,j;floats,t;scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d",&n);s=0;for(i=1;i<=n;i++){t=1;for(j=1;j<=i;j++)t=t*j;s=s+1.0/t;}printf("%0.4f",s);}}#include"stdio.h"intmain(){intri,repeat;inti,n;doubles;doublefact(

2、intn);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d",&n);s=0;for(i=1;i<=n;i++)s=s+1/fact(i);printf("%0.4f",s);}return0;}doublefact(intn){inti;doubleresult;result=1;for(i=1;i<=n;i++)result=result*i;returnresult;}统计一个整数中数字的个数#include"stdio.h"intmain(){intri,repeat;intcount;

3、longin;intcountdigit(longnumber,intdigit);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%ld",&in);count=countdigit(in,2);printf("count=%d",count);}}intcountdigit(longnumber,intdigit){inti,count=0,t;if(number<0)number=-number;for(i=1;;i++){t=number%10;if(t==digit)count++;numb

4、er=number/10;if(number==0)break;}returncount;#include"stdio.h"#include"math.h"intmain(){intri,repeat;intcount,digit,i,j,k,m,n,sum;scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d",&m,&n);count=0;sum=0;digit=0;for(i=m;i>=m&&i<=n;i++){for(j=2;j<=n/2;j++)if(i%j==0)break;if(j>i/

5、2&&i!=1){count++;sum=sum+i;}}printf("count=%d,sum=%d",count,sum);}}}统计素数并求和#include"stdio.h"#include"math.h"intmain(){intri,repeat;intcount,i,m,n,sum;intprime(intm);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){scanf("%d%d",&m,&n);sum=0;count=0;for(i=m;i<=n;i++){if(prime(i)==1){cou

6、nt++;sum=sum+i;}}printf("count=%d,sum=%d",count,sum);}}intprime(intm){inti;if(m==1)return0;if(m>1){for(i=2;i<=m/2;i++){if(m%i==0){return0;}}if(i>m/2)return1;}}求完数#include"stdio.h"intmain(){intri,repeat;inti,m,n;longfactorsum(intnumber);scanf("%d",&repeat);for(ri=1;ri<=repeat;ri++){

7、scanf("%d%d",&m,&n);for(i=m;i<=n;i++){if(i==factorsum(i))printf("%d",i);}printf("");}}longfactorsum(intnumber){inti,sum=0;if(number==1)return1;for(i=1;i

8、(“%6d”,x);X1