Compare version number

Signed-off-by: begeekmyfriend <[email protected]>

Author: begeekmyfriend

165_compare_version_numbers/Makefile

@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test version.c

165_compare_version_numbers/version.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+static int compareVersioin(char *v1, char *v2)
+{
+    int ret = 0;
+    while (*v1 != '\0' || *v2 != '\0') {
+        while (*v1 != '\0' && *v1 == '0') {
+            v1++;
+        }
+        while (*v2 != '\0' && *v2 == '0') {
+            v2++;
+        }
+
+        int n1 = 0;
+        while (*v1 != '\0' && *v1 != '.') {
+            n1 = n1 * 10 + (*v1 - '0');
+            v1++;
+        }
+
+        int n2 = 0;
+        while (*v2 != '\0' && *v2 != '.') {
+            n2 = n2 * 10 + (*v2 - '0');
+            v2++;
+        }
+
+        ret = n1 - n2;
+        if (ret != 0) {
+            return ret > 0 ? 1 : -1;
+        }
+
+        if (*v1 == '.') {
+            v1++;
+        }
+        if (*v2 == '.') {
+            v2++;
+        }
+    }
+    return ret;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc != 3) {
+        fprintf(stderr, "Usage: ./test versioin1 version2\n");
+        exit(-1);
+    }
+    printf("%d\n", compareVersioin(argv[1], argv[2]));
+    return 0;
+}