服务器接收消息并从小写转换为大写

Question

接收“hi i is man”等消息并将其转换为大写“HI I AM MAN”的代码。

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Answer 1

对大写和小写使用toupper和tolower函数

#include <iostream>       // std::cout
#include <string>         // std::string
#include <locale>         // std::locale, std::toupper
int main (){
  std::locale loc;
  std::string str="Test String.\n";
  for (std::string::size_type i=0; i<str.length(); ++i)
    std::cout << std::toupper(str[i],loc);
return 0;
}

Answer 2

#include <stdio.h>
#include <ctype.h>

  n = read(newsockfd, buffer, 255);
  for(int i = 0; i < n; i++)
    buffer[i] = toupper(buffer[i]);
  printf("Here is the message: %s\n", buffer);