Morris' Blog 我在摸索我存在的意義、生命的意義、內涵及價值。 沒有真正神手般的厲害，套用模式是大部分的情況。 沒那麼厲害的我存在的意義為何，襯托出神的存在？ 有時候不能怪別人不給我機會，我已經開始省思， 為什麼我沒有給別人機會的原因，而是全要靠別人。 有時候我認為我與眾不同，那是因為我做不到很多人能辦到的事情。 我聽不到、玩不起來、說得不夠明瞭、理解得不夠多， 我缺少的語文能力，就是一切一切無能的判定。 為此，我不曉得能做些對別人有幫助的事情。 我知道我自己是個不服輸的性格，但現在我不得不認輸。 我沒有能力，因此我必須認輸。 我到底來這世界作什麼？處處充滿不確定性， 而我總是無法出類拔萃，想當個一般人似乎也回不了頭了。 越強大的挑戰需要越強力的支持，而我的支持是什麼？ 最近嘗試與人談話，但都是失敗的結局，沒人能接受， 不需要言語，不需要溝通，一切所想都表達不出來。

49愛的鼓勵 6訂閱站台

When we need to find the arithmetic average of some numbers we always tend to keep the result in a floating-point number as in many cases the average is a fraction. But if all the numbers are integers then we should not use floating-point numbers to store the average, as floating-point numbers can lead to all sorts of precision errors. In this problem your job is to find the average of some integers and express it in the form a or or a, where a, b and c are all integers. In this problem we will denote this average as avg.

a)

If | avg| > 1 and a fractional number then we should print it as a

b)

If | avg| < 1 and a fractional number then we should print it as

c)

If avg is an integer we should print it as a

d)

If avg is negative then the whole result should be preceded by a minus (`-') sign and a space.

e)

In the printed fractional part b and c should be relative prime. In other words gcd(b, c) should be 1.

f)

The horizontal bar in the fraction should be formed using only the hyphen (`-'). Its length should be equal to the number of digits in c. If the number of digits in b is less than c then b should be right justified on the horizontal bar.

Input 

The input file contains less than 101 sets of input. Each set of input is given in a single line. The description of each line is given below:

The first integer n ( 1n100) of a line denotes how many numbers are to be averaged. It is followed by n numbers, all of which have absolute values less than 10000.

Input is terminated by a case where n = 0. This case should not be processed.

Output 

For each line of input produce two or four lines of outputs. The first line contains the serial number of the output. The next one or three lines contain the value of the average following the rules specified above. The output lines should not contain any trailing spaces. And there must not be any leading or trailing spaces other than the ones that are required for formatting.

Sample Input 

3 1 2 3
3 -1 -2 -3
3 1 2 4
4 2 4 6 10
3 -1 -2 -4
10 1 1 1 1 1 1 1 1 1 4
10 1 -1 1 -1 1 -1 -1 1 1 1
10 1 -1 1 -1 1 -1 -1 1 1 -3
0

Sample Output 

Case 1:
2
Case 2:
- 2
Case 3:
 1
2-
 3
Case 4:
 1
5-
 2
Case 5:
   1
- 2-
   3
Case 6:
  3
1--
 10
Case 7:
1
-
5
Case 8:
  1
- -
  5

#include <stdio.h>
#include <string.h>
int gcd(int x, int y) {
    int t;
    while(x%y)
        t = x, x = y, y = t%y;
    return y;
}
int getNumLen(int n) {
    char m[15];
    sprintf(m, "%d", n);
    return strlen(m);
}
int main() {
    int n;
    int cases = 0;
    while(scanf("%d", &n), n) {
        int i, x, y, sum = 0;
        for(i = 0; i < n; i++)
            scanf("%d", &x), sum += x;
        int flag = 1;
        if(sum < 0) flag = -1, sum *= -1;
        x = sum%n, y = n, sum /= n;
        int g = gcd(x, y);
        x /= g, y /= g;
        printf("Case %d:\n", ++cases);
        if(sum >= 1) {
            if(y == 1) {
                if(flag < 0)    printf("- ");
                printf("%d\n", sum);
            } else {
                int w = 0;
                if(flag < 0)    w += 2;
                w += getNumLen(sum)+getNumLen(y);
                for(i = w-getNumLen(x); i > 0; i--)  putchar(' ');
                printf("%d\n", x);
                if(flag < 0)    printf("- ");
                printf("%d", sum);
                for(i = getNumLen(y); i > 0; i--)   putchar('-');
                puts("");
                for(i = w-getNumLen(y); i > 0; i--) putchar(' ');
                printf("%d\n", y);
            }
        } else {
            if(y == 1) {
                if(flag < 0)
                    printf("- ");
                printf("%d\n", sum);
            } else {
                int w = 0;
                if(flag < 0)    w += 2;
                w += getNumLen(y);
                for(i = w-getNumLen(x); i > 0; i--)  putchar(' ');
                printf("%d\n", x);
                if(flag < 0)    printf("- ");
                for(i = getNumLen(y); i > 0; i--)   putchar('-');
                puts("");
                for(i = w-getNumLen(y); i > 0; i--) putchar(' ');
                printf("%d\n", y);
            }
        }

    }
    return 0;
}