字符数组输入

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#include <iostream>
using namespace std;
int main (){
    char c;
    do {
      c=getchar();
      cout<<c;
} while (c != '.');
return0;
}

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#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，*/
/*函数 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';
}


int main()
{
	char s1[100], s2[300];
	printf( "input s1:" );
	gets( s1 );     //gets函数功能为读入整行字符串s1
	expand( s1, s2 );
	printf( "%s\n", s2 );
}