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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6. char * istr(int n)
  7. {
  8.     char s[20] = { 0 }, // С запасом :)
  9.         *c = s+19;
  10.     int sign = (n < 0) ? (n*=-1, -1) : (n==0) ? 0 : 1;
  11.     if (n == 0) *--c = '0';
  12.     else
  13.     {
  14.         for(; n; n/=10) *--c = n%10+'0';
  15.         if (sign < 0)   *--c = '-';
  16.     }
  17.     char * r = new char[s+20-c];
  18.     char *q = r;
  19.     while(*q++ = *c++);
  20.     return r;
  21. }
  22.  
  23. int sint(const char * s)
  24. {
  25.     int n = 0, sign = 1;
  26.     if (*s == '-') { sign = -1; s++; }
  27.     while(*s) n = n*10 + *s++ - '0';
  28.     return n*sign;
  29. }
  30.  
  31. int main()
  32. {
  33.     cout << "[" << istr(0) << "]\n";
  34.     cout << "[" << istr(10) << "]\n";
  35.     cout << "[" << istr(-20) << "]\n";
  36.     cout << "[" << istr(1450) << "]\n";
  37.     cout << "[" << istr(-213451230) << "]\n";
  38.     cout << "[" << sint(istr(0)) << "]\n";
  39.     cout << "[" << sint(istr(10)) << "]\n";
  40.     cout << "[" << sint(istr(-20)) << "]\n";
  41.     cout << "[" << sint(istr(1450)) << "]\n";
  42.     cout << "[" << sint(istr(-213451230)) << "]\n";
  43. }
  44.  
Success #stdin #stdout 0s 4332KB
comments (?)
stdin
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Standard input is empty
stdout
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[0]
[10]
[-20]
[1450]
[-213451230]
[0]
[10]
[-20]
[1450]
[-213451230]
https://ideone.com/EoI3Qt
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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