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  1. #include <cctype>
  2. #include <cstring>
  3. #include <iostream>
  4.  
  5. int main() {
  6.     char s[100];
  7.     char oper = 0;
  8.     int res1 = 0, res2 = 0, a = 0;
  9.     std::cin.getline(s, sizeof(s));
  10.     int len = strlen(s);
  11.     for (int i = 0; i < len; i++) {
  12.         while (isdigit(s[i]) && i < len) {
  13.             res1 = 10 * res1 + s[i] - '0';
  14.             i++;
  15.         }
  16.         while (s[i] == ' ' && i < len) i++;
  17.         oper = s[i++];
  18.         while (s[i] == ' ' && i < len) i++;
  19.         while (isdigit(s[i]) && i < len) {
  20.             res2 = 10 * res2 + s[i] - '0';
  21.             i++;
  22.         }
  23.     }
  24.     switch (oper) {
  25.     case '+':
  26.         a = res1 + res2;
  27.         break;
  28.     case '-':
  29.         a = res1 - res2;
  30.         break;
  31.     case '*':
  32.         a = res1 * res2;
  33.         break;
  34.     case '/':
  35.         if (res2) a = res1 / res2;
  36.         else std::cout << "\nError\n";
  37.         break;
  38.     case '%':
  39.         if (res2) a = res1 % res2;
  40.         else std::cout << "\nError\n";
  41.         break;
  42.     default:
  43.         std::cout << "\nError\n";
  44.         break;
  45.     }
  46.     std::cout << a << '\n';
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0s 4192KB
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https://ideone.com/D5uSC1
Simple caculator
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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