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Fibonacci Series
0 1 1 2 3 5 8 13 21 34...


#include <stdio.h>
int main()
{
  int i,a=0,b=1,c;

  for(i=0;i<20;i++) /*This condition will print first 20 numbers of the Fibonacci series*/
  {
    printf("%d \t",a);
    
    a+=b;
    
    c=a;
    a=b;
    b=c;
  }
  return 0;
}