C语言解法
字符个数统计
http://www.nowcoder.com/questionTerminal/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include<stdio.h>
#include<string.h>
int main()
{
char c=0,str[128] = { 0 };
int a=0,n=0;
while (scanf("%c", &c)!=EOF)
{
a = (int)c;
if (str[a] == 0&&a!=10)
n++;
str[a] = c;
}
printf("%d\n", n);
} 
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