Int 到 ASCII 字符和 char 到 ASCII 数字 | C++

Question

我必须编写一个简短的脚本，它将 int 更改为 ASCII char 并将 char 更改为 ASCII int。但我不知道怎么做。我写了这个简短的代码，但是出了点问题。我正在编程半年。 有人可以编写它吗？这是我第一次在c++中使用函数

#include <iostream>
#include <conio.h>

using namespace std;
char toChar(int n) {
return n + '0';
}
int toInt(char c) {
return c - '0';
}
int main()
{
int number;
cout << "Int: ";
cin >> number;
cout << "ASCII: " << static_cast<char>(number);
getch();
return 0;
}

Answer 1

非常感谢你们，我已经用更短且有效的代码完成了。

#include <iostream>
using namespace std;
int main(){
int a=68;
cout<<char(a);
char c='D';
cout<<int(c);
return 0;
}

Answer 2

你也可以使用printf，所以你不需要创建其他函数来转换数字。

int i = 64;
char c = 'a';

printf("number to ascii corresponding to %d is %c\n", i, i);
printf("ascii to number corresponding to %c is %d\n", c, c);

输出会是

number to ascii corresponding to 64 is A
ascii to number corresponding to a is 97

Answer 3

也许你可以从下面的代码开始。如果这不完整，您能否用测试用例完成您的问题？

#include <iostream>


using namespace std;

char toChar(int n)
{   //you should test here the number shall be ranging from 0 to 127
    return (char)n;
}

int toInt(char c)
{
    return (int)c;
}

int main()
{
    int number = 97;
    cout << "number to ascii corresponding to  " << number << " is " <<(char)number << " or " << toChar(number) <<endl;

    char car='H';
    cout << "ascii to number corresponding to " << car << " is " << (int)car << " or " << toInt(car) << endl;

    return 0;
}

输出是：

number to ascii corresponding to  97 is a or a
ascii to number corresponding to H is 72 or 72

Answer 4

#include <iostream>

using namespace std;

char toChar(int n)
{
    if (n > 127 || n < 0)
        return 0;
    return (char)n;
}

int toInt(char c)
{
    return (int)c;
}

int main()
{
    int number = 97;
    cout << "char corresponding to number " << number << " is '" <<  toChar(number) << "'\n";

    char car='H';
    cout << "number corresponding to char '" << car << "' is " << toInt(car) << "\n";

    return 0;
}

输出：

char corresponding to number 97 is 'a'
number corresponding to char 'H' is 72'

---

最初我以为您只是想转换数字： 您可以简单地在 char 和 char 中添加和减去“0”：

char toChar(int n) {
    return n + '0';
}

int toInt(char c) {
    return c - '0';
}

如果你只是想cast the type, read this