advanced level a1001

Author: 2lovecode

CCodes/PatQuestionBank/AdvancedLevel/A1001.c

@@ -0,0 +1,62 @@
+/*
+1001 A+B Format（20 分）
+
+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 Specification:
+
+Each input file contains one test case. Each case contains a pair of integers a and b where −10​6​​≤a,b≤10​6​​. The numbers are separated by a space.
+Output Specification:
+
+For each test case, you should 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
+
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main ()
+{
+	int a, b, i, cnt = 0, cc = 0;
+	int sum, str_len;
+	int flag = 0;
+	char s[20], c[20];
+
+	if (!scanf("%d %d", &a, &b)) {
+		return 1;
+	}
+
+	sum = a + b;
+
+	if (sum < 0) {
+		flag = 1;
+	}
+	sprintf(s, "%d", sum);
+
+	str_len = strlen(s);
+
+	for (i = str_len - 1; i >= 0; i--) {
+		c[cnt++] = s[i];
+		cc++;
+		if (cc % 3 == 0) {
+			if (i != 0) {
+				if (!flag || i != 1) {
+					c[cnt++] = ',';
+					cc = 0;
+				}
+			}
+		}
+	}
+
+	for (i = cnt - 1; i >= 0; i--) {
+		printf("%c", c[i]);
+	}
+	return 0;
+}