题目:输入一个英文句子,翻转句子中单词的顺序,但单词内字符的顺序不变。句子中单词以空格符隔开。为简单起见,标点符号和普通字母一样处理。例如输入“I am a student.”,则输出“student. a am I”。
思路:首先将整个句子按字符翻转,然后再将其中每个单词的字符旋转。
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#include <string> #include "stdafx.h" void Reverse( char *pBegin, char *pEnd) { if (pBegin == NULL || pEnd == NULL) return ; while (pBegin < pEnd) { char temp = *pBegin; *pBegin = *pEnd; *pEnd = temp; pBegin ++, pEnd --; } } char * ReverseSentence( char *pData) { if (pData == NULL) return NULL; char *pBegin = pData; char *pEnd = pData; while (*pEnd != '\0' ) pEnd ++; pEnd--; // 翻转整个句子 Reverse(pBegin, pEnd); // 翻转句子中的每个单词 pBegin = pEnd = pData; while (*pBegin != '\0' ) { if (*pBegin == ' ' ) { pBegin ++; pEnd ++; } else if (*pEnd == ' ' || *pEnd == '\0' ) { Reverse(pBegin, --pEnd); pBegin = ++pEnd; } else { pEnd ++; } } return pData; } int main() { char input[] = "I am a student." ; printf ( "%s\n\n" ,input); printf ( "After reverse.\n\n" ); ReverseSentence(input); printf ( "%s\n" , input); return 0; } |
再给大家分享一段一位国外网友的实现方法
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#include <stdio.h> #include <string.h> int main() { char str[50001], ch; int i, low, high, tmp, len; while ( gets ( str ) ) { low = 0; high = 0; len = strlen ( str ); while ( low < len ) { while ( str[low] == ' ' ) { low++; } high = low; while ( str[high] ) { if ( str[high] == ' ' ) { high--; break ; } else { high++; } } if ( str[high] == '\0' ) { high--; } tmp = high + 1; while ( low < high ) { ch = str[low]; str[low] = str[high]; str[high] = ch; low++; high--; } low = tmp; high = tmp; } for ( i = len - 1; i > 0; i-- ) { printf ( "%c" , str[i]); } printf ( "%c\n" , str[0]); } return 0; } |
再来一个小编的代码
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#include <iostream> using namespace std; void reverse_part( char *, int pBegin, int pEnd); void reverse( char *str) { //n为字符串长度 int n= strlen (str)-1; reverse_part(str,0,n); int pBegin=0,pEnd=0; while (str[pEnd+1]){ if (str[pEnd]!= ' ' && str[pEnd]!= '\0' ) ++pEnd; //找到空格 else { reverse_part(str,pBegin,pEnd-1); //如果下一个还是空格 while (str[pEnd+1]!= '\0' && str[pEnd+1]== ' ' ) ++pEnd; pBegin=++pEnd; } } cout<<str<<endl; } void reverse_part( char *str, int pBegin, int pEnd) { char temp; for ( int i=pBegin;i<=(pEnd-pBegin)/2;++i){ temp=str[i]; str[i]=str[pEnd-i]; str[pEnd-i]=temp; } } void main() { char str[]= "I am a student." ; reverse(str); system ( "pause" ); } #include <iostream> using namespace std; void reverse_part( char *, int pBegin, int pEnd); void reverse( char *str) { //n为字符串长度 int n= strlen (str)-1; reverse_part(str,0,n); int pBegin=0,pEnd=0; while (str[pEnd+1]){ if (str[pEnd]!= ' ' && str[pEnd]!= '\0' ) ++pEnd; //找到空格 else { reverse_part(str,pBegin,pEnd-1); //如果下一个还是空格 while (str[pEnd+1]!= '\0' && str[pEnd+1]== ' ' ) ++pEnd; pBegin=++pEnd; } } cout<<str<<endl; } void reverse_part( char *str, int pBegin, int pEnd) { char temp; for ( int i=pBegin;i<=(pEnd-pBegin)/2;++i){ temp=str[i]; str[i]=str[pEnd-i]; str[pEnd-i]=temp; } } void main() { char str[]= "I am a student." ; reverse(str); system ( "pause" ); } |
以上就是解决单词顺序翻转的3种方法了,希望小伙伴们能够喜欢