统计字符串"abcABC123RedFlag",有几个大写字符?(C语言编写)

#include<stdio.h>
main()
{
int i=0,n=0;
char str[30]="abcABC123RedFlag";
for(i=0;str[i]!='\0';i++)
if( str[i]>='A'&&str[i]<='Z' )
n++;
printf("共有%d个大写字母\n",n);
}