using this c++ code add these improvements -want to ignore whitespace -allow number #include #include #include int lookahead; void expr(void); void rest(void); void term(void); void match(int); void error(void); int main(void) { lookahead = getchar(); expr(); putchar('\n'); /* adds trailing newline character */ } void term(void) { if (isdigit(lookahead)) { putchar(lookahead); match(lookahead); } else error(); } void match(int t) { if (lookahead == t) lookahead = getchar(); else error(); } void error(void) { printf("syntax error\n"); /* print error message */ exit(1); /* then halt */ } void expr(void) { term(); while ( 1) { if (lookahead == '+') { match('+'); term(); putchar('+'); } else if (lookahead == ' - ') { match(' - '); term(); putchar(' - '); } else break; } }
using this c++ code add these improvements -want to ignore whitespace -allow number #include #include #include int lookahead; void expr(void); void rest(void); void term(void); void match(int); void error(void); int main(void) { lookahead = getchar(); expr(); putchar('\n'); /* adds trailing newline character */ } void term(void) { if (isdigit(lookahead)) { putchar(lookahead); match(lookahead); } else error(); } void match(int t) { if (lookahead == t) lookahead = getchar(); else error(); } void error(void) { printf("syntax error\n"); /* print error message */ exit(1); /* then halt */ } void expr(void) { term(); while ( 1) { if (lookahead == '+') { match('+'); term(); putchar('+'); } else if (lookahead == ' - ') { match(' - '); term(); putchar(' - '); } else break; } }
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question
using this c++ code add these improvements
-want to ignore whitespace
-allow number
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
int lookahead;
void expr(void);
void rest(void);
void term(void);
void match(int);
void error(void);
int main(void)
{
lookahead = getchar();
expr();
putchar('\n'); /* adds trailing newline character */
}
void term(void)
{
if (isdigit(lookahead)) {
putchar(lookahead);
match(lookahead);
}
else
error();
}
void match(int t)
{
if (lookahead == t)
lookahead = getchar();
else
error();
}
void error(void)
{
printf("syntax error\n"); /* print error message */
exit(1); /* then halt */
}
void expr(void) {
term();
while (
1) {
if (lookahead == '+') {
match('+');
term();
putchar('+');
}
else if (lookahead == ' - ') {
match(' - ');
term();
putchar(' - ');
}
else
break;
}
}
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