setw

Given the following code: /*Formatting Output **Goal: practice using cout to format output to console **Print the variables in three columns: **Ints, Floats, Doubles */ #include <iostream> #include <iomanip> using namespace std; int main() { int a = 45; float b = 45.323; double c = 45.5468; int aa = a + 9; float bb = b + 9; double cc = c + 9; int aaa = aa + 9; float bbb = bb + 9; double ccc = cc + 9; // 1st attempt :> cout << "\n\n\n" << "// 1st attempt :>" << "\n"; cout << "12345678901234567890123456789012345678901234567890" << "\n"; cout << "Ints" << setw(15) << "Floats" << setw(15) <<

I am trying to use set width setw for string output to an output file, however, I am not able to make it work. I have with me the following example. // setw example #include <iostream> #include <iomanip> #include <fstream> int main () { std::ofstream output_file; output_file.open("file.txt"); output_file << "first" <<std::setw(5)<< "second"<< std::endl; output_file.close(); return 0; } Edit: With the above lines I expected to have many spaces between first and second , something like first second I hardly see any spaces, the output just comes like firstsecond I think I missed the working of

So I'm learning some stuff in College on C++, and the teacher and I got into a discussion on how to actually center text to the output screen. So my suggestion was to use setw but get the length of the string and the size of the console screen, do the algorithm and BAM we have truly centered text. He says the screen size is 80 but the screen can be resized, which doesn't work no matter what if the output is centered the the user starts resizing. Just a minor question I have, how to get the actual size of the console screen? #include <iostream> #include <string> using namespace std; const int

I recently was bitten by the fact that ios_base::width and/or the setw manipulator have to be reset with every item written to the stream . That is, you must do this: while(whatever) { mystream << std::setw(2) << myval; } Rather than this: mystream.width(2); while(whatever) { mystream << myval; } Ok, fine. But does anyone know why this design decision was made? Is there some rationale that I'm missing, or is this just a dark corner of the standard? Other stream formatting modifiers (as mentioned in the linked SO question) are 'sticky', while setw is not. The way i see it is : You can always do

Is there a way to make setw and setfill pad the end of a string instead of the front? I have a situation where I'm printing something like this. CONSTANT TEXT variablesizeName1 .....:number1 CONSTANT TEXT varsizeName2 ..........:number2 I want to add a variable amount of '.' to the end of "CONSTANT TEXT variablesizeName#" so I can make ":number#" line up on the screen. Note: I have an array of "variablesizeName#" so I know the widest case. Or Should I do it manually by setting setw like this for( int x= 0; x < ARRAYSIZE; x++) { string temp = string("CONSTANT TEXT ")+variabletext[x]; cout <<