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  1. #include <iostream>
  2. #include <algorithm>
  3.  
  4. #define Repeat do{
  5. #define Until(cond) }while(!(cond))
  6.  
  7. void printer(int i)
  8. {
  9.     std::cout<<i<<" ";
  10. }
  11.  
  12. int main()
  13. {
  14.     int i = 0;
  15.  
  16.     //Simulating Pascal/Delphi's repeat until loop.
  17.     //This loop will run once and then check the condition.
  18.     //After that, it will continue again if the condition is true.
  19.     Repeat
  20.         std::cout<<i<<" ";
  21.         ++i;
  22.     Until(i == 10);
  23.  
  24.     i = 0;
  25.     std::cout<<"\n";
  26.  
  27.     //will only run while this condition is true.. i must be less than 10 for the loop to start and continue.
  28.     //in other words, the loop will only start and continue if the condition is true.
  29.     while (i < 10)
  30.     {
  31.         std::cout<<i<<" ";
  32.         ++i;
  33.     }
  34.  
  35.     std::cout<<"\n";
  36.     i = 0;
  37.  
  38.     //will run at least once. The condition is checked after the first run.
  39.     //If it is true, the loop will run again and continue running while the condition is true.
  40.     do
  41.     {
  42.         std::cout<<i<<" ";
  43.         ++i;
  44.     } while(i < 10);
  45.  
  46.     std::cout<<"\n";
  47.     i = 0;
  48.  
  49.     //sets the initial value of J to 0.
  50.     //While (J < 10) the loop will run.
  51.     //At the end of each iteration, J is incremented.
  52.     for (int j = 0; j < 10; ++j)
  53.     {
  54.         std::cout<<j<<" ";
  55.     }
  56.  
  57.     std::cout<<"\n";
  58.  
  59.  
  60.  
  61. 	//You must be using a C++11 compiler to use any of the following loops!!
  62.  
  63.     int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  64.  
  65. 	//for each integer in arr, call lambda function and pass that integer as an argument.
  66. 	//in this case, the function is [](int i) {  std::cout<<i<<" ";  }
  67.     std::for_each(&arr[0], &arr[10], [](int i) {std::cout<<i<<" ";});
  68.     std::cout<<"\n";
  69.  
  70.  
  71.     //same as above.. for each integer in arr, call the printer function and pass that integer
  72.     //as an argument. Thus every loop it does:  printer(i); where i is an integer in arr array.
  73.     std::for_each(&arr[0], &arr[10], printer);
  74.     std::cout<<"\n";
  75.  
  76. 	//for-ranged loop.
  77. 	//for each integer in arr, copy the value to variable i and print it.
  78.     for(int i : arr)
  79.     {
  80.         std::cout<<i<<" ";
  81.     }
  82.  
  83.     std::cout<<"\n";
  84.  
  85.  
  86. 	//for each integer in arr, do NOT copy the value. Instead, reference it and print it.
  87. 	//this allows you to be able to change the value of i and it'd change the value in the array.
  88.     for (int &i : arr)
  89.     {
  90.         std::cout<<i<<" ";
  91.     }
  92.  
  93.     std::cout<<"\n";
  94.  
  95.  
  96.     //for each "something" in "some array", copy it to variable i and print it.
  97.     for (auto i : arr)
  98.     {
  99.     	std::cout<<i<<" ";
  100.     }
  101.  
  102.     std::cout<<"\n";
  103.  
  104.  
  105.     //for each "something" in "some array", do NOT copy it. Reference it and print it.
  106.     for (auto &i : arr)
  107.     {
  108.         std::cout<<i<<" ";
  109.     }
  110. }
  111.  
Success #stdin #stdout 0s 3340KB
comments (?)
stdin 
Standard input is empty
stdout 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9 
0 1 2 3 4 5 6 7 8 9
https://ideone.com/J1Epmc
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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