Thursday, May 23, 2013

C - String Problem (non-letter Input) - Dream In Code


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    5 Replies - 55 Views - Last Post: 48 minutes ago Rate Topic: -----

    #1 Etain ?Icon User is offline

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    Posted Today, 07:18 AM

    Hello, I need help with a program that reads in a string, detailing the occurrence of each letter (based of keyboard input). So far the program reads the string and shows the number of letters that occur. I was wondering if anyone could help me with allowing my program to output the number of non letter used.
    
 #include <stdio.h> #include <string.h>   int main() {    char string[100], ch;    int c = 0, count[26] = {0};      printf("Please enter a string\n");    gets(string);      while (string[c] !='\0')    {       if ( string[c] >= 'a' && string[c] <= 'z' )           count[string[c]-'a']++;         c++;    }      for ( c = 0 ; c < 26 ; c++ )    {       if( count[c] != 0 )          printf("%c occurs %d times in the entered string.\n",c+'a',count[c]);    }      return 0; }  


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    Replies To: C - String problem (non-letter input)

    #2 jimblumberg ?Icon User is offline

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    Re: C - String problem (non-letter input)

    Posted Today, 07:40 AM

    First you should never use gets()! This function is very dangerous because it doesn't limit the number of characters it will receive. I recommend changing to fgets()

    Are you allowed to use the functions in ctype.h, like isdigit() and isalpha()?

    Jim


    #3 Etain ?Icon User is offline

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    Re: C - String problem (non-letter input)

    Posted Today, 07:47 AM

    Thanks for reply. Functions in ctype.h have not been covered in the course.


    #4 Etain ?Icon User is offline

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    Re: C - String problem (non-letter input)

    Posted Today, 07:54 AM

    How do I implement fgets?


    #5 jimblumberg ?Icon User is offline

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    Re: C - String problem (non-letter input)

    Posted Today, 08:00 AM

    So then what have you tried? You seem to be aware of the ASCII table.

    Also what happens if your string contains upper case letters?

    Also posted here.

    Quote

    How do I implement fgets?

    Start by studying the link I provided.

    Jim

    This post has been edited by jimblumberg: Today, 08:00 AM


    #6 DblAAssassin ?Icon User is online

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    Re: C - String problem (non-letter input)

    Posted 48 minutes ago

    fgets(string_name, size_of_string, stdin);

    Stdin stands for standard input, which is referred to using the keyboard. So you only use stdin if the string is being typed in via keyboard.

    So.

    
 fgets(string, 100, stdin); 

    Is how you would apply in your code.

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