C :

#include <stdio.h>
int main()
{
     int f1 = 1,f2 = 1,i,f3;
     printf("%d\n",f1);
     printf("%d\n",f2);
     for(i = 3;i <= 20;i ++)
     {
          f3 = f1 + f2;
          f1 = f2;
          f2 = f3;
          printf("%d\n",f3);
     }
     return 0;
}

C++ :

#include <cstdio>
int main (void){
	int a[20],i;
	a[0]=a[1]=1;
		for(i=2;i<20;i++){
			a[i]=a[i-1]+a[i-2];
	}
		for(i=0;i<20;i++)
			printf("%d\n",a[i]);
	return 0;
}

Pascal :

var i:longint;
a:array[0..21]of longint;
begin
a[1]:=1;a[2]:=1;
for i:=3 to 20 do a[i]:=a[i-1]+a[i-2];
for i:=1 to 20 do writeln(a[i]);end.