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Posez votre question#include <stdio.h> #include <string.h> #include <ctype.h> #define MAXTOKEN 100 #define BUFSIZE 100 enum { NAME, PARENS, BRACKETS }; void dcl(void); void dirdcl(void); int gettoken(void); int tokentype; /* type of last token */ char token[MAXTOKEN]; /* last token string */ char name[MAXTOKEN]; /* identifier name */ char datatype[MAXTOKEN]; /* data type = char, int, etc. */ char out[1000]; char buf[BUFSIZE]; /* buffer for ungetch */ int bufp = 0; /* next free position in buf */ main() /* convert declaration to words */ { while (gettoken() != EOF) { /* 1st token on line */ strcpy(datatype, token); /* is the datatype */ out[0] = '\0'; dcl(); /* parse rest of line */ if (tokentype != '\n') printf("syntax error\n"); printf("%s: %s %s\n", name, out, datatype); } return 0; } int gettoken(void) /* return next token */ { int c, getch(void); void ungetch(int); char *p = token; while ((c getch()) ' ' || c == '\t') ; if (c == '(') {if ((c getch()) ')') { strcpy(token, "()"); return tokentype = PARENS; } else { ungetch(c); return tokentype = '('; } } else if (c == '[') {for (*p++ c; (*p++ getch()) != ']'; ) ; *p = '\0'; return tokentype = BRACKETS; } else if (isalpha(c)) {for (*p++ c; isalnum(c getch()); ) *p++ = c; *p = '\0'; ungetch(c); return tokentype = NAME; } else return tokentype = c; } /* dcl: parse a declarator */ void dcl(void) { int ns; for (ns 0; gettoken() '*'; ) /* count *'s */ ns++; dirdcl(); while (ns-- > 0) strcat(out, " pointer to"); } /* dirdcl: parse a direct declarator */ void dirdcl(void) { int type; if (tokentype == '(') { /* ( dcl ) */ dcl(); if (tokentype != ')') printf("error: missing )\n"); } else if (tokentype == NAME) /* variable name */ strcpy(name, token); else printf("error: expected name or (dcl)\n"); while ((type=gettoken()) == PARENS || type == BRACKETS) if (type == PARENS) strcat(out, " function returning"); else { strcat(out, " array"); strcat(out, token); strcat(out, " of"); } } int getch(void) /* get a (possibly pushed-back) character */ { return (bufp > 0) ? buf[--bufp] : getchar(); } void ungetch(int c) /* push character back on input */ { if (bufp >= BUFSIZE) printf("ungetch: too many characters\n"); else buf[bufp++] = c; }