字符统计个数

每个字符对应唯一，忘了换行符的码了，故赋初值count为-1
#include<stdio.h>
int main(){
char num = 0,str[128] = {0};
int count = -1;
while(scanf("%c",&num) != EOF){
str[(int)num-1] = 1;
}
for(int i = 0;i < 128;i++)
{
if(str[i] != 0)
count++;
}
printf("%d",count);
return 0;
}