Linux下的C语言基础编程——统计字符

#include <stdio.h>

int main()
{
int upper = 0;
int lower = 0;
int digit = 0;
int space = 0;
int other = 0;
int i=0;
char *p;
char s[20];
printf("input string:  ");

while ((s[i] = getchar()) != '\n') i++;
p=&s[0];

while (*p != '\n')
{
if (('A' <= *p) && (*p <= 'Z'))
++upper;
else if (('a' <= *p) && (*p <= 'z'))
++lower;
else if (*p == ' ')
++space;
else if ((* p<= '9') && (*p >= '0'))
++digit;
else
++other;
p++;
}
printf("upper case:%d     lower case:%d",upper,lower);
printf("     space:%d     digit:%d      other:%d\n",space,digit,other);

return 0;
}