refactor

9 Algorithms Job Interview/codes/1 string/proc.c

@@ -0,0 +1,35 @@
+#include "stdio.h"
+
+char *proc(char *str){
+	char *start = str;
+	char *end = str;
+	if (str == NULL) return NULL;
+	while(*end != '\0') end++;
+	end--;
+
+	while(start < end){
+		if (*start >= 'A' && *start <= 'Z'){//大写
+			if (*end >= 'a' && *end <= 'z'){
+				char tmp = *start;
+				*start = *end;
+				*end = tmp;
+
+				start++;
+			}
+			end--;
+		}else{//小写
+			if (*end >= 'A' && *end <= 'Z'){
+				end--;
+			}
+			start++;
+		}
+	}	
+	return str;
+}
+
+int main(int argc, char const *argv[])
+{
+	char test[] = "HaJKPnobAACPc";//"char *test" always make "28767 bus error"
+	printf("%s\n", proc(test));
+	return 0;
+}