c++ - Is there a way to display my prime number list output in 2 columns? -
i taking first programming class , first time posting. have been able find on site previous projects when got stuck, , hope doing right.
i have completed program below display prime number between 0 , 100 intro c++ class.
the thing kinda bothers me in single column, wanted go step , make nice , display numbers in couple columns. tried using "\t", can't work right. ideas on might add code? think using array have not covered in class , i'm not supposed use them yet.
the challenge was:
"use isprime function wrote in programming challenge 21 in program stores list of prime numbers 1 through 100 in file."
and here code:
#include <iostream> #include <iomanip> #include <cstdlib> #include <string> using namespace std; bool isprime(int); int main() { static int num1=0; cout<<"listed below prime numbers 1 through 100."<<endl<<endl<<endl; { num1++; if (isprime(num1)) { cout<<num1<<endl; } } while (num1<100); cout<<endl; return 0; } bool isprime(int num1) { bool primenum=true; (int i=2;i<num1;i++) { if (num1%i==0) { primenum=false; } } return primenum; } thanks in advance input,
find cout.width()
#include <iostream> #include <iomanip> #include <cstdlib> #include <string> using namespace std; bool isprime(int); int main() { static int num1 = 0; cout << "listed below prime numbers 1 through 100." << endl << endl << endl; int column = 0; // column variable int width = 10; // column width size { num1++; if (isprime(num1)) { cout.width(width); // set column's width cout << num1; if (column == 1) { // if prime number printed in column 2 cout << endl; // add new line column = 0; // set column first } else { column++; // increase column index } } } while (num1<100); cout << endl; return 0; } bool isprime(int num1) { // error: isprime returns true when num1 1 or 2. change if (num1 == 1 || num1 == 2) return false; // isprime bool primenum = true; (int = 2; i<num1; i++) { if (num1%i == 0) { primenum = false; } } return primenum; }