/**************************************************************************
* 将给定的含有大小写字母的字符串中的小写字母放在前面，大写字母放在后面
* 如 aAbBcCdD -> abcdABCD
**************************************************************************/
#include <stdio.h>
#include <stdlib.h>
int SmallToCaptial( char *str, char *outbuf )
{
char *p = str;
if (str == NULL || outbuf == NULL)
{
return -1;
}
while (*p)
{
if (*p >= 'a' && *p <= 'z')
{
*outbuf++ = *p; //小写字母放在前面
}
p++;
}
p = str;
while (*p)
{
if (*p >= 'A' && *p <= 'Z')
{
*outbuf++ = *p; //找到大写字母接在后面
}
p++;
}
*outbuf = '\0'; //加上结束标志
return 0;
}
int main()
{
char *str = NULL; //含有大小写字母的字符串
char outbuf[100] = {0}; //存放处理好的字符串
str = (char *)malloc(100 * sizeof(char));
printf ("please input a string (with capital letter and small letter):\n");
scanf ("%s", str);
printf ("The original string is %s\n", str);
if( SmallToCaptial(str, outbuf) == -1 )
{
printf ("function SmallToCaptial error!\n");
return -1;
}
printf ("The result is %s\n", outbuf);
free(str);
return 0;
}
