Function: 统计一行字符串中 的单词个数，并将 每个单词首字母 变为大写字母
1 /* 2 * File: lineword.cpp 3 * ------------------ 4 * This program converts initial letter of every word in line to upper. 5 */ 6 7 #include <iostream> 8 #include <string> 9 10 std::string lineToWord(std::string line); 11 std::string wordToUpper(std::string word); 12 13 int num; //number of words in line 14 15 int main() 16 { 17 std::string line; 18 num = 0; 19 std::cout<< "please enter string message: "; 20 getline(std::cin, line); 21 std::cout<< "result:[ " << num << " words ] "<< lineToWord(line) << std::endl; 22 23 return 0; 24 } 25 26 /* 27 * Function: lineToWord 28 * Usage: string translation = lineToWord(word); 29 * --------------------------------------------- 30 * acquire every word in line. 31 */ 32 33 std::string lineToWord(std::string line) 34 { 35 std::string result = ""; 36 int start = -1; //是否为单词的首字母的标识符 37 for(int i = 0; i < line.length(); i++) 38 { 39 char ch = line[i]; 40 if(isalpha(ch)) //isalpha()函数，判断字符是否为一字母 41 { 42 if(start == -1) start = i; 43 } 44 else 45 { 46 if(start >= 0) 47 { 48 result += wordToUpper(line.substr(start, i - start)); //.substr()，截取输入行中的单词 49 start = -1; 50 } 51 result += ch; //加上非字母的其它字符 52 } 53 } 54 if(start >= 0) result += wordToUpper(line.substr(start)); //处理最后一个单词 55 return result; 56 } 57 58 /* 59 * Function: wordToUpper 60 * Usage: string word = wordToUpper(word); 61 * --------------------------------------- 62 * convert the initial letter of word to upper letter 63 */ 64 65 std::string wordToUpper(std::string word) 66 { 67 char ch = toupper(word[0]); //toupper()，转换为大写字母 68 word = ch + word.substr(1); 69 num++; 70 return word; 71 }执行
