c++ - How does while input work? -

how does

while(cin >> variable)

actually work? status loop until there no input or new input every time.

you @ first read values of value1, value2, value3

inputfile >> value1; inputfile >> value2; inputfile >> value3;

and overwrite them in loop statement

while (inputfile >> value1 >> value2 >> value3){

the same valid read operations in end of loop

inputfile >> value1; inputfile >> value2; inputfile >> value3; }

remove these statements before loop , in end of loop.

also check whether 3 numbers form valid tringle plenty check each 2 numbers greater 3rd number.

c++ file-io

Three