int getop(char s[]) {
if(lp == lineLength) {
lineLength = getline(line, MAXLINE);
lp = 0;
}
if(lineLength == 0)
return EOF;
char c;
int i;
while((s[0] = c = line[lp++]) == ' ' || c == '\t')
;
s[1] = '\0';
if(!isdigit(c) && c != '.' && c != '-') {
return c;
}
i = 0;
if(c == '-') {
if(isdigit(line[lp]) || line[lp] == '.') {
c = line[lp];
}
else {
return c;
}
}
if(isdigit(c)) {
while(isdigit((s[++i] = c = line[lp++])))
;
}
if(c == '.') {
while(isdigit((s[++i] = c = line[lp++])))
;
}
lp--;
return NUMBER;
}