conditions for multiple variables in while loop c++ -

im trying while loop show "invalid input" while loop 3 variables. im starting out c++ im not best @ trying show need here in terms.

while(children1,children2,children3)<1||(children1,children2,children3)>100)  cout << "invalid input"; return 0; 

it's easiest to express each requirement separately:

while (children1 < 1 || children2 < 1 || children3 < 1 ||        children1 > 100 || children2 > 100 || children3 > 100)     std::cout << "invalid input\n"; 

a c++11 alternatives is:

#include <algorithm>  ...  while (std::min({ children1, children2, children3 }) < 1 ||        std::max({ children1, children2, children3 }) > 100)     std::cout << "invalid input\n"; 

fwiw, if kept numbers in std::vector - arguably more elegant - option available:

std::vector<int> children; children.push_back(23); children.push_back(123); children.push_back(13); // ...however many like...  while (std::any_of(std::begin(children), std::end(children),                     [](int n) { return n < 1 || n > 100; }))     std::cout << "invalid input\n"; 

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note if intend multiple instructions controlled statement while, if, or for, need group them using braces:

int retries_available = 3; while (std::any_of(std::begin(children), std::end(children),                     [](int n) { return n < 1 || n > 100; })) {     std::cout << "invalid input\n";     if (retries_available-- == 0)         return 0;     get_new_values_for(children); }