1092.cpp

这是哈尔滨工业大学acmOJ的源代码

/*  This Code is Submitted by wywcgs for Problem 1092 on 2006-02-10 at 16:38:33 */ 
#include <cstdio>
#include <cstring>
#include <cctype>

bool error;
char line[256], ch;

inline void wrong() { error = true; printf("TOKEN ERROR\n"); gets(line); }

int main()
{
	int i;

	while((ch = getchar()) != EOF) {
		ungetc(ch, stdin); error = false;
		while(true) {
			if(error && gets(line)[0] == 0) break;
			for(i = 0; !error && (ch = getchar()) != '\n'; i++) {
				if(ch == '\n') break;
				else if(isspace(ch)) continue;
				else if(ch == ':') {
					if((ch = getchar()) == '=') printf(":=\n");
					else wrong();
				} else if(ch == '(' || ch == ')' || ch == '+' || ch == ';' || ch == ',') printf("%c\n", ch);
				else if(ch == '-') {
					if((ch = getchar()) == '-') gets(line), ch = '\n';
					else printf("-\n");
					ungetc(ch, stdin);
				} else if(isalnum(ch)) {
					ungetc(ch, stdin); scanf("%[A-Za-z0-9'_']", line);
					int l; bool digit = true;
					for(l = 0; line[l] != 0; l++)
						if(!isdigit(line[l])) digit = false;
					if(digit && l > 8) wrong();
					else if(!digit && l > 32) wrong();
					else printf("%s\n", line);
				} else wrong();
			}
			if(!error && i == 0) break;
		}
		putchar('\n');
	}
	
	return 0;
}