Loop-10. Calculate the sum of the First N items of the sequence,-10

Loop-10. Calculate the sum of the First N items of the sequence,-10

1/* 2 * Main. c 3 * C10-loop-10. evaluate the N items before the sequence and 4 * Created on: July 30, 2014 5 * Author: in the Boomkeeper 6 ******** section, ******** 7 */8 9 # include <stdio. h> 10 11 int main (void) {12 13 double sum = 0.0; // records the first N items and 14 int numerator = 2, denominator = 1; // molecular denominator 15 int N; // N16 int I in the question; // use 17 int tem = 0; 18 19 scanf ("% d", & N) cyclically ); 20 21 if (N = 1) 22 printf ("%. 2f \ n ", (double) numerator/denominator); 23 else {24 sum = (double) numerator/denominator; 25 for (I = N; I> 1; I --) {26 tem = denominator; 27 denominator = numerator; 28 numerator = numerator + tem; 29 sum + = (double) numerator/denominator; 30} 31 printf ("%. 2f \ n ", sum); 32} 33 34 return 0; 35}

Not perfect...

 

Question link:

Http://pat.zju.edu.cn/contests/basic-programming/%E5%BE%AA%E7%8E%AF-10

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Sequence and -- Recursive C Language

# Include <stdio. h>

Float xulie (int x );

Void main ()
{
Int n;
Scanf ("% d", & n );
Printf ("% f", xulie (n ));

}

Float xulie (int x)
{
If (x = 1)
Return 1;
Else
Return (x % 2 = 0 )? Xulie (x-1) + 1.0/x: xulie (x-1)-1.0/x;
}

The first 10 items of the Series: 2/1, 3/2, 5/3, 8/5, And. Use C language to write programs.

Is it necessary to use a large array ~
In the next version: Correct the version ~

# Include <stdio. h>

Void main ()
{
Int a = 1, B = 2, c, I;
Double sum = 2;
For (I = 1; I <10; I ++)
{
C = a + B, a = B, B = c;
Sum + = double (B)/;
}
Printf ("the top 10 columns are: % f \ n", sum );
}
Result: 16.479906 ~

Will no array overflow error occur in the first answer ?~ D [10] what is it? It is used without initialization, and a division by zero error occurs ~

The second obvious misunderstanding of the meaning of the landlord ~ In addition, the number of columns must be accumulated to the tenth item, and the integer column must be counted as the fifth item ~