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各种各样的输入输出挂!!!
先上C的:
适用于正int的.
1 int read() 2 { 3 char ch=‘ ‘; 4 int ans=0; 5 while(ch<‘0‘ || ch>‘9‘) 6 ch=getchar(); 7 while(ch<=‘9‘ && ch>=‘0‘) 8 { 9 ans=ans*10+ch-‘0‘;10 ch=getchar();11 }12 return ans;13 }
适用于正负int / LL / double 的. (来自 风神)
1 template <class T> 2 bool scan_d(T &ret) 3 { 4 char c; 5 int sgn; 6 T bit=0.1; 7 if(c=getchar(), c==EOF) 8 return 0; 9 while(c!=‘-‘ && c!=‘.‘ && (c<‘0‘ || c>‘9‘))10 c=getchar();11 sgn=(c==‘-‘)? -1:1;12 ret=(c==‘-‘)? 0:(c-‘0‘);13 while(c=getchar(), c>=‘0‘ && c<=‘9‘)14 ret=ret*10+(c-‘0‘);15 if(c==‘ ‘ || c==‘\n‘)16 {17 ret*=sgn;18 return 1;19 }20 while(c=getchar(), c>=‘0‘ && c<=‘9‘)21 ret+=(c-‘0‘)*bit, bit/=10;22 ret*=sgn;23 return 1;24 }
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然后是 java 的.
1 import java.util.StringTokenizer; 2 import java.io.BufferedReader; 3 import java.io.IOException; 4 import java.io.InputStreamReader; 5 import java.math.*; 6 import java.io.*; 7 import java.util.*; 8 9 class Scanner 10 {11 BufferedReader br;12 StringTokenizer st;13 public Scanner(InputStream in) 14 {15 br = new BufferedReader(new InputStreamReader(in));16 eat("");17 }18 private void eat(String s) 19 {20 st = new StringTokenizer(s);21 }22 public String nextLine()23 {24 try25 {26 return br.readLine();27 } 28 catch (IOException e) 29 {30 return null;31 }32 }33 public boolean hasNext() 34 {35 while (!st.hasMoreTokens())36 {37 String s = nextLine();38 if(s == null)39 return false;40 eat(s);41 }42 return true;43 }44 public String next()45 {46 hasNext();47 return st.nextToken();48 }49 public int nextInt()50 {51 return Integer.parseInt(next());52 }53 long nextLong()54 {55 return Long.parseLong(next());56 }57 double nextDouble() 58 {59 return Double.parseDouble(next());60 }61 }
while(in.hasNext()) 是输入到EOF结束
输入BigInteger 要
BigInteger a=new BigInteger(in.next());
前期一直用这个
后来... 发现另一个更短的...
缓冲输入流
包含了输入输出和输出挂
1 import java.io.*; 2 import java.util.*; 3 import java.math.*; 4 5 public class Main 6 { 7 public static void main(String[] args) throws NumberFormatException, IOException 8 { 9 BufferedReader in = new BufferedReader(new InputStreamReader(System.in));10 PrintWriter out = new PrintWriter(System.out);11 12 13 14 out.close();15 }16 }
仅能输入string 或单个字符
如输入 int:
int t=new Integer(in.readLine());
至今不会如何EOF...
所以, 综上!
1 import java.io.*; 2 import java.util.*; 3 import java.math.*; 4 5 public class Main 6 { 7 8 public static void main(String[] args) 9 {10 InputReader in = new InputReader();11 PrintWriter out = new PrintWriter(System.out);12 13 14 15 out.close();16 }17 }18 class InputReader19 {20 BufferedReader buf;21 StringTokenizer tok;22 InputReader()23 {24 buf = new BufferedReader(new InputStreamReader(System.in));25 }26 boolean hasNext()27 {28 while(tok == null || !tok.hasMoreElements()) 29 {30 try31 {32 tok = new StringTokenizer(buf.readLine());33 } 34 catch(Exception e) 35 {36 return false;37 }38 }39 return true;40 }41 String next()42 {43 if(hasNext()) return tok.nextToken();44 return null;45 }46 int nextInt()47 {48 return Integer.parseInt(next());49 }50 long nextLong()51 {52 return Long.parseLong(next());53 }54 double nextDouble()55 {56 return Double.parseDouble(next());57 }58 BigInteger nextBigInteger()59 {60 return new BigInteger(next());61 }62 BigDecimal nextBigDecimal()63 {64 return new BigDecimal(next());65 }66 }
各种各样的输入输出挂!!!
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