View Code of Problem 48

 #include<stdio.h>
            #include<math.h>
            int main()
            {
              int i,n;
              double c,a=2,b=1;
              double sum=0.0;
              scanf("%d",&n);
              for(i=0;i<n;i++)
              {
                sum+=a/b;
                c=a+b;
                b=a;
                a=c;
              }
              printf("%.6f",sum);
              return 0;
            }