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Jan 30th, 2005

Problem with string search of an array

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I am just learning C/C++. My problem is to determine if a character is or isn't within an array then returning an appropriate message to the user. I've only gotten this far using 'strchr' without much success. Any suggestions or help would be appreciated. Should I be using pointers instead within the function?

Thank you

Program Char Search */

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char check(char c, char str);

main()

{ char response;
char strg[] = "Array test";
printf("%s\n", strg);

{ Printf("Enter the character you would like to search for.");

Scanf(" %c\n", &response);
}

/*function 'check'*/
{
char check(char str[],char c);
str = strg;
c = response;
scanf("strchr: %s\n",&strg);

if strchr=c
printf("The character is %s\n",c);
}

return 0;
}

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cricket

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Jan 30th, 2005

Re: Problem with string search of an array

Using strchr it would look something like this.

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int check(char str[], int search);
 
int main(void)
{
  char buf[BUFSIZ];
  int ch;
 
  printf("Enter a string: ");
  fflush(stdout);
  if (fgets(buf, sizeof buf, stdin) == NULL)
    return EXIT_FAILURE;
 
  printf("Enter a character to search for: ");
  fflush(stdout);
  if ((ch = getchar()) == EOF)
    return EXIT_FAILURE;
 
  if (check(buf, ch))
    printf("%c was found\n", ch);
  else
    printf("%c was not found\n", ch);
 
  return EXIT_SUCCESS;
}
 
int check(char str[], int search)
{
  return strchr(str, search) != NULL;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int check(char str[], int search);

int main(void)
{
  char buf[BUFSIZ];
  int ch;

  printf("Enter a string: ");
  fflush(stdout);
  if (fgets(buf, sizeof buf, stdin) == NULL)
    return EXIT_FAILURE;

  printf("Enter a character to search for: ");
  fflush(stdout);
  if ((ch = getchar()) == EOF)
    return EXIT_FAILURE;

  if (check(buf, ch))
    printf("%c was found\n", ch);
  else
    printf("%c was not found\n", ch);

  return EXIT_SUCCESS;
}

int check(char str[], int search)
{
  return strchr(str, search) != NULL;
}

You can also do it manually if you want.

C++ Syntax (Toggle Plain Text)
int check(char str[], int search)
{
  int i;
 
  for (i = 0; str[i] != '\0'; i++) {
    if (search == str[i])
      return 1;
  }
 
  return 0;
}
int check(char str[], int search)
{
  int i;

  for (i = 0; str[i] != '\0'; i++) {
    if (search == str[i])
      return 1;
  }

  return 0;
}

Siersan

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Jan 30th, 2005

Re: Problem with string search of an array

Thank you very much. I will try this.

cricket

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Jan 31st, 2005

Re: Problem with string search of an array

[QUOTE=Siersan]Using strchr it would look something like this.

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int check(char str[], int search);
 
int main(void)
{
  char buf[BUFSIZ];
  int ch;
 
  printf("Enter a string: ");
  fflush(stdout);
  if (fgets(buf, sizeof buf, stdin) == NULL)
    return EXIT_FAILURE;
 
  printf("Enter a character to search for: ");
  fflush(stdout);
  if ((ch = getchar()) == EOF)
    return EXIT_FAILURE;
 
  if (check(buf, ch))
    printf("%c was found\n", ch);
  else
    printf("%c was not found\n", ch);
 
  return EXIT_SUCCESS;
}
 
int check(char str[], int search)
{
  return strchr(str, search) != NULL;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int check(char str[], int search);

int main(void)
{
  char buf[BUFSIZ];
  int ch;

  printf("Enter a string: ");
  fflush(stdout);
  if (fgets(buf, sizeof buf, stdin) == NULL)
    return EXIT_FAILURE;

  printf("Enter a character to search for: ");
  fflush(stdout);
  if ((ch = getchar()) == EOF)
    return EXIT_FAILURE;

  if (check(buf, ch))
    printf("%c was found\n", ch);
  else
    printf("%c was not found\n", ch);

  return EXIT_SUCCESS;
}

int check(char str[], int search)
{
  return strchr(str, search) != NULL;
}

Just a friendly note:
fgets() will append a \n to the string, if you then just press enter at the character search prompt you will find the \n. The answer will be: was found

vegaseat

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DaniWeb's Hypocrite

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Jan 31st, 2005

Re: Problem with string search of an array

>if you then just press enter at the character search prompt you will find the \n.
That's reasonable (and expected) behavior. Let's say you want to test for exceptionally long lines:

C++ Syntax (Toggle Plain Text)
while (fgets(buffer, sizeof buffer, stdin) != NULL && !check(buffer, '\n')) {
  /* Append buffer to a dynamic string */
}
while (fgets(buffer, sizeof buffer, stdin) != NULL && !check(buffer, '\n')) {
  /* Append buffer to a dynamic string */
}

If you don't want to find the newline, then remove it before the test, or verify the value of the search character as being neither EOF nor '\n'.

Narue

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Jan 31st, 2005

Re: Problem with string search of an array

Quote originally posted by Narue ...

>if you then just press enter at the character search prompt you will find the \n.
That's reasonable (and expected) behavior.

No argument with that! It's the result telling me that an invisible character was found that can be confusing to the user.

vegaseat

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DaniWeb's Hypocrite

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