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HDU1169-Lowest Bit
Lowest BitTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 7514 Accepted Submission(s): 5517
Given an positive integer A (1 <= A <= 100), output the lowest bit of A.
For example, given A = 26, we can write A in binary form as 11010, so the lowest bit of A is 10, so the output should be 2.
Another example goes like this: given A = 88, we can write A in binary form as 1011000, so the lowest bit of A is 1000, so the output should be 8.
Input
Each line of input contains only an integer A (1 <= A <= 100). A line containing "0" indicates the end of input, and this line is not a part of the input data.
Output
For each A in the input, output a line containing only its lowest bit.
Sample Input
26
88
0
Sample Output
2
8
水題，為了測試強大的itoa函數
itoa函數簡介：
功能：將任意類型的數字轉換為字符串。在<stdlib.h>中與之有相反功能的函數是atoi。
用法
char *itoa(int value, char *string, int radix);
int value 被轉換的整數，char *string 轉換後儲存的字符數組，int radix 轉換進製數，如2,8,10,16 進製等
頭文件: <stdlib.h>
比如十進製數n轉二進製，可以寫itoa(n,a,2)（轉換成一個字符串形式的數，a是n轉換成的字符型數）
AC代碼：
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
char s[1000];
int main()
{
int i,j,n,m,sum,p;
while(scanf("%d",&n)&&n)
{
itoa(n,s,2);
//printf("%s\n",s);
m=strlen(s);p=0;
for(i=m-1;i>=0;i--)
{
p++;
if(s[i]=='1')
{
m=p-1;
break;
}
}
sum=1;
for(i=m-1;i>=0;i--)
sum*=2;
printf("%d\n",sum);
}
return 0;
}
最後更新：2017-04-03 08:26:14