1001. A + B format (20) -- Pat (Advanced Level) practise

Question information:

1001. A + B format (20) Time Limit 400 MS
The memory limit is 32000 kb.
Code length limit: 16000 B
Criterion author Chen, Yue

Calculate a + B and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits ).

Input

Each input file contains one test case. Each case contains a pair of integers A and B where-1000000 <= A, B <= 1000000. The numbers are separated by a space.

Output

For each test case, You shocould output the sum of A and B in one line. The sum must be written in the standard format.

Sample Input

-1000000 9

Sample output

-999,991

The Code is as follows:

#include <stdio.h>int main(){int a, b;char arr[30], flag;arr[29] = '\0';while (scanf("%d%d", &a, &b) != EOF){int k = 29;int s = a + b, t = 0;flag = 0;if (s < 0){flag = 1;s *= -1;}if (s == 0)arr[--k] = '0';while (s){arr[--k] =  '0' + s % 10;if (++t == 3){t = 0;if (s >= 10)arr[--k] = ',';}s /= 10;}if (flag)arr[--k] = '-';printf("%s\n", arr + k);}return 0;}

1001. A + B format (20) -- Pat (Advanced Level) practise