9-6.txt

c primer 部分习题答案

#include <stdio.h>
int inp(char ch);
int main(void)
{
	char ch;
	printf("Now you enter:");
	for( ; scanf("%c", & ch) == 1; )
	{
		if((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))
			printf("%c is a character, CN:%d\n", ch, inp(ch));
		else if(ch != '\n')
			printf("%c isn't a character, CN:%d\n", ch, inp(ch));
		
	}
	return 0;
}
int inp(char ch)
{
	if(ch >= 'A' && ch <= 'Z')
		return (ch - 'A' + 1);
	if(ch >= 'a' && ch <= 'z')
		return (ch - 'a' + 1);
	else return -1;
}