getche（）之后缺少第一个字母

Question

我的问题是输入的内容是什么，执行时总是会漏掉单词“输出：”的第一个字母“ o”。关键是该代码在Dev C ++上可以正常工作，但在Visual Studio中仍然缺少“ o”。我认为这可能与getche（）函数有关，与键盘缓冲区有关，但是我该如何解决呢？

#include <iostream>
#include <conio.h>
#define convertDifference 7 // the difference value of converting one to another
#define input_max 100 //determine input length   
#define stopKey 27  // 27 --> ansi decimal for "Esc"

int main(){
    char input[input_max] = {0}; 
    int i = 0;
    // retrieve input----------------------------------
    std::cout << "input: ";
    input[i] = _getche();

    while ((int)input[i] != stopKey) {
        i++;
        if (i > input_max-1) {
            std::cout << "\ninput max exceed";
            break;
        }
        else {
            _getche(); // clears keyboard buffer  (if unable to compile or run, change "_getche()" into "getche()")
            //for compilers that ignore keyboard buffers, comment or delete the above line code
            input[i] = _getche();  // if unable to compile or run, change "_getche()" into "getche()"
        }
    }

    // convert & output--------------------------------
    puts("");

    i = 0;
    std::cout << "output: ";
    while (i <= input_max - 1 && ((int)input[i] != stopKey)) {  //check if exceeded max of input length or stopKey appears
        std::cout << (char)(input[i] - convertDifference);
        i++;
    }
    puts("");
    return 0;
}