没有C/C++标准库,你没有选择,除了手工编写转换功能,如:
template <int N>
const char* uint_to_string(
unsigned int val,
char (&str)[N],
unsigned int base = 10)
{
static_assert(N > 1, "Buffer too small");
static const char* const digits = "ABCDEF";
if (base < 2 || base > 16) return nullptr;
int i = N - 1;
str[i] = 0;
do
{
--i;
str[i] = digits[val % base];
val /= base;
}
while (val != 0 && i > 0);
return val == 0 ? str + i : nullptr;
}
template <int N>
const char* int_to_string(
int val,
char (&str)[N],
unsigned int base = 10)
{
// Output as unsigned.
if (val >= 0) return uint_to_string(val, str, base);
// Output as binary representation if base is not decimal.
if (base != 10) return uint_to_string(val, str, base);
// Output signed decimal representation.
const char* res = uint_to_string(-val, str, base);
// Buffer has place for minus sign
if (res > str)
{
const auto i = res - str - 1;
str[i] = '-';
return str + i;
}
else return nullptr;
}
用法:
char buf[100];
terminal_writestring(int_to_string(42, buf)); // Will print '42'
terminal_writestring(int_to_string(42, buf, 2)); // Will print '101010'
terminal_writestring(int_to_string(42, buf, 8)); // Will print '52'
terminal_writestring(int_to_string(42, buf, 16)); // Will print '2A'
terminal_writestring(int_to_string(-42, buf)); // Will print '-42'
terminal_writestring(int_to_string(-42, buf, 2)); // Will print '11111111111111111111111111010110'
terminal_writestring(int_to_string(-42, buf, 8)); // Will print '37777777726'
terminal_writestring(int_to_string(-42, buf, 16)); // Will print 'FFFFFFD6'
活生生的例子:http://cpp.sh/5ras
你说:“const char *'”,但你没有真正说出你想要的结果。你想要空格分隔的十进制表示吗?十六进制表示? ASCII编码的字符等值?什么? –
ASCII编码的字符相当于 如果计数= 50我想要50由终端打印 – skyline
那么,这是空格分隔的十进制表示,而不是ASCII选项(在您的示例中,这可能是字符“P”)。请将具体要求添加到问题本身。 –