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  1. #include <cstring>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     setlocale(LC_CTYPE, "rus");
  8.     cout << "Введите строку: ";
  9.     char arr[100], num[10], znak = '+';
  10.     int summa = 0;
  11.     cin.getline(arr, 100);
  12.     for (int i = 0, j = 0; i < strlen(arr); i++)
  13.     {
  14.         if (strchr("+-", arr[i]))
  15.         {
  16.             if (znak == '+')
  17.                 summa += atoi(num);
  18.             else
  19.                 summa -= atoi(num);
  20.             j = 0;
  21.             num[0] = '\0';
  22.             znak = arr[i];
  23.         }
  24.         else
  25.         {
  26.             num[j++] = arr[i];
  27.             num[j] = '\0';
  28.         }
  29.     }
  30.     if (znak == '+') 
  31.         summa += atoi(num);
  32.     else 
  33.         summa -= atoi(num);
  34.     cout << arr << " = " << summa << endl;
  35.     system("pause");
  36.     return 0;
  37. }
Success #stdin #stdout #stderr 0s 5048KB
comments (?)
stdin 
3+3-5
stdout 
Введите строку: 3+3-5 = 1
stderr 
sh: pause: not found
https://ideone.com/6fNjh3
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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