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Borland C++ String question

Posted on 1997-09-21
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Last Modified: 2008-03-06
I need to create a function called MyStringFunct which accept 2 built-in strings(character arrays terminated by '\0') as parameters and returns an integer.

int MyStringFunct( char * parm1, char * parm2 )

The program should process according to the following:

Parm1          Parm2         Processing               Return value
"Initialize"   "Any Text"  Store Parm2 in a static              -1
                                      variable local to
                                      MyStringFunct

"Vowels"     NULL                                          No. of vowels
                                                                       in the static
                                                                       variable.

"Consonants" NULL                                      No. of conso-
                                                                      nents in the
                                                                      static variable.

Note: Be sure the function should work no matter what order the above calls are made.

More: How to change the parm1 to be a pointer to a function. Implement the same actions using different functions for "Init", "Vowel" etc..

Could you please write me some code so I can work on this exercise in my book?

Thanks
Chris Lee            
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Comment
Question by:ny971181
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4 Comments
 
LVL 5

Accepted Solution

by:
yonat earned 10 total points
ID: 1170158
#include <string.h>
#include <ctype.h>

#define MAX_TEXT_LEN 100

int Initialize(char* text, char* content);  /* copy content into text */
int Vowles(char* text);                     /* number of vowels in text */
int Consonants(char* text);                 /* number of consonants in text */

int MyStringFunct( char* param1, char* param2)
{
    static char text[MAX_TEXT_LEN] = "";

    if (!strcmp(param1, "Initialize"))
        return Initialize(text, param2);
    else if (!strcmp(param1, "Vowels"))
        return Vowles(text);
    else if (!strcmp(param1, "Consonants"))
        return Consonants(text);
   
    return -1; // error in input
}

int Initialize(char* text, char* content)
{
    strcpy(text, content);
    return -1;
}

int IsVowel(int c)
{
    c = tolower(c);
    return ( c == 'a' || c == 'e' || c == 'i'
             || c == 'o' || c == 'u');
}

int Vowles(char* text)
{
    int count = 0;

    while (*text != '\0') {
        if (IsVowel(*text))
            ++count;
        ++text;
    }

    return count;
}

int Consonants(char* text)
{
    int count = 0;

    while (*text != '\0') {
        if (isalpha(*text) && !IsVowel(*text))
            ++count;
        ++text;
    }

    return count;
}

0
 
LVL 1

Author Comment

by:ny971181
ID: 1170159
It looks fine but is it true that it has to have a main() in a program?

Chris Lee

Urgent!

0
 
LVL 5

Expert Comment

by:yonat
ID: 1170160
int main()
{
    char buf[MAX_TEXT_LEN];

    for(;;) {
        cout << "Enter string to analyze\n";
        cin >> buf;
        cout << '\n';
        MyStringFunct("Initialize", buf);
        cout << "The number of vowels is " <<
            MyStringFunct("Vowels", NULL) <<
            ", and the number of consonants is " <<
            MyStringFunct("Consonants", NULL) << ".\n";
    }

    return 0;
}

0
 
LVL 1

Author Comment

by:ny971181
ID: 1170161
thanks a lot

chris
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