c++ - Can't print Fibonacci series -

c++ - Can't print Fibonacci series -

i writing little snippet fibonacci number sequence depending on user input. if user supplies 4 input, should homecoming him first n members of fibonacci sequence.

#include <iostream> using namespace std; int main (){ int = 0; int b = 1; int c; int n = 3; n -= 2; if (n == 1){ cout << << endl; } else { cout << << b << endl; (int i=0;i<n;i++){ c = b + a; cout << c << endl; = b; b = c; } } }

however, end getting 0 output whatever number supply. have working in php , kinda miss i've blundered. guess don't render input , output properly.

int =0; int n = 3; n -= 2; if (n == 1){ cout << << endl; }

you have n equal 3, subtract 2, n equal 1, so, come in if body , output a, zero.

[edit]

you don't seem input -as stated in comment- in programme (you utilize std::cin or std::getline() this), mean have input hard-coded, changing value of n hand.

you may want check how fibonacci series programme expected work:

fib. @ rosseta page. fib. recursion non-recursive fib.

after reading links provided above, should able see code should changed this:

#include <iostream> using namespace std; int main (){ int = 1; int b = 0; int c; int n = 10; // "input" 10 if (n == 0 || n == 1) { // 0 , 1 case cout << n << endl; } else { (int = 2; <= n; ++i) { // here want reach n c = + b; b = a; = c; } cout << c << endl; } homecoming 0; }

however, code above outputs result. should modify terms of sequence, i'll leave have fun too.

in order allow user input number, change:

int n = 10;

to

int n; std::cout << "please, input.\n"; std::cin >> n;

however, letting user inputting must followed validation of input. see users can, accident or not, provide input in program, can cause undefined behaviour.

c++ fibonacci