NOIP 2007年信息学奥赛初赛普及组阅读程序写结果：
#include "ctype.h"
#include "stdio.h"
void expand(char s1[], char s2[]) {
int i, j, a, b, c;
j = 0;
for (i = 0; (c = s1[i]) != '\0'; i++)
if (c == '-') {
a = s1[i - 1];
b = s1[i + 1];
if (isalpha(a) && isalpha(b) || isdigit(a) && isdigit(b))
/*函数isalpha(a)用于判断字符a是否为字母,isdigit(b) 用于判断字符b是否为数字,如果是,返回1,否则返回0 */
{
j--;
do
s2[j++] = a++;
while (tolower(a) < tolower(s1[i + 1]));
}
/*函数tolower(a)的功能是当字符a是大写字母,改为小写,其余情况不变*/
else s2[j++] = c;
} else s2[j++] = c;
s2[j] = '\0';
}
main() {
char s1[100], s2[300];
printf("input s1:");
gets(s1);
expand(s1, s2);
printf("%s\n", s2);
}输入:wer2345d-h454-82qqq
输出：