#include<stdio.h>
void  main()
{
          int   a,b;
          for(a=1,b=2;b<50;) {
                    printf("%d  %d  ",a,b);
                    a=a+b;
                    b=a+b;
           }
           printf("\n");
}
请高手把详细的解题步骤好思路写下来