输出字符的ASCII值 [英] Output ASCII value of character

问题描述

#include <iostream>

using namespace std;

int main()
{
    char x;
    cout << "enter a character:";
    cin >> x;
    cout << "ASCII Value of " << x << "is" << string(x);
    return 0 ;
}

错误是

main.cpp||In function 'int main()':| 
main.cpp|10|error: invalid conversion from 'char' to 'const char*'| 
main.cpp|10|error:   initializing argument 1 of 'std::basic_string<_CharT, _Traits,_Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'|
||=== Build finished: 2 errors, 0 warnings ===|

推荐答案

std::cout << "ASCII Value of " << x << "is" << (int)x;

是一种方法(强制转换绕过了I/O流库对char类型的特殊处理)，但是这将输出平台的字符编码值，而不必要 ASCII.

is one way (the cast circumvents the special treatement of a char type by the I/O stream library), but this will output your platform's encoded value of the character, which is not necessarily ASCII.

一种便携式解决方案要复杂得多:您需要在128个元素的数组中编码ASCII集，该数组可以存储7位无符号值，然后将x映射到该元素的合适元素.

A portable solution is much more complex: You'll need to encode the ASCII set in a 128 element array of elements capable of storing a 7 bit unsigned value, and map x to a suitable element of that.

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