Text to declaration: Write a program to convert input in a specific format into C language declarations-EEWORLD

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1. Program Function

Write a program to convert input in a specific format into C language statements.

2. Program source code

#include

#define MAXTOKEN 100

enum {NAME, PARENS, BRACKETS};

int tokentype;

char token[MAXTOKEN];

char name[MAXTOKEN];

char datatype[MAXTOKEN];

char out[1000];

int p_getch(void);

void p_ungetch(int);

int main(void)

{

int type, lasttype;

char temp[MAXTOKEN];

printf("Please input(ctrl+z to quit)\n");

while (gettoken() != EOF)

{

strcpy(out, token);

lasttype = 0;

while ((type = gettoken()) != '\n')

{

if (type == NAME)

{

sprintf(temp, "%s %s", token, out);

strcpy(out, temp);

}

else

{

if (lasttype == '*')

{

sprintf(temp, "(%s)", out);

strcpy(out, temp);

}

if (type == PARENS || type == BRACKETS)

strcat(out, token);

else if (type == '*')

{

sprintf(temp, "*%s", out);

strcpy(out, temp);

}

else

printf("Error: Invalid input at %s!\n", token);

}

lasttype = type;

}

printf("%s\n",out);

}

return 0;

}

int gettoken(void)

{

int c;

char *p = token;

while ((c = p_getch()) == ' ' || c == '\t')

;

if (c == '(')

{

if ((c = p_getch()) == ')')

{

strcpy(token, "()");

return tokentype = PARENT;

}

else

{

p_ungetch(c);

return tokentype = '(';

}

else if (c == '[')

{

for (*p++ = c; (*p++ = p_getch()) != ']';)

;

*p = '\0';

return tokentype = BRACKETS;

}

else if (isalpha(c))

{

for (*p++ = c; isalnum(c = p_getch());)

*p++ = c;

*p = '\0';

p_ungetch(c);

return tokentype = NAME;

}

else

return tokentype = c;

}

#define BUFSIZE 100

char buf[BUFSIZE];

int bufp = 0;

int p_getch(void)

{

return (bufp > 0) ? buf[--bufp]: getchar();

}

void p_ungetch(int c)

{

if (bufp < BUFSIZE)

buf[bufp++] = c;

else

printf("Error: (ungetch) Too many chars in buffer1\n");

}

3. Summary of the program

for example:

Input: x * char

Output: char *x

Input: daytab * [13] int

Output: int (*daytab)[13]

Reference address：Text to declaration: Write a program to convert input in a specific format into C language declarations

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