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Converting lowercase to capital

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Converting lowercase to capital

Oct 30th, 2007

I am writing code that accepts a string of a filename, then capitalize the letters, not changing any numbers or special characters. I think I am on the right path, but can some one give a little push to the right direction.

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CHARSIZE 101
 
int main()
{
    char filename[CHARSIZE];
 
    printf("Enter the filename that you want to open. /n");
    gets(filename);
 
    toupper(filename);
 
    puts(filename);
 
    return 0;  
}
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CHARSIZE 101

int main()
{
    char filename[CHARSIZE];
    
    printf("Enter the filename that you want to open. /n");
    gets(filename);
    
    toupper(filename);
    
    puts(filename);
    
    return 0;  
}

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Re: Converting lowercase to capital

Oct 30th, 2007

>>toupper(filename);
Nope. toupper() only accepts a singlle character. There are no standard functions that converts the entire string, so you have to write that part youself. Put the below in a loop and you will have it.



filename[0] = toupper(filename[0]);

>>gets(filename);
Never ever use gets(). use fgets() instead like this: fgets(filename,CHARSIZE,stdin);

Last edited by Ancient Dragon; Oct 30th, 2007 at 2:42 pm.

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Re: Converting lowercase to capital

Oct 30th, 2007

You might also find the following tutorial useful...
http://www.daniweb.com/tutorials/tutorial45806.html

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Re: Converting lowercase to capital

Oct 30th, 2007

have revised, It still doesnt work exactly though

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CHARSIZE 101
 
void convert (char strng[]);
 
int main()
{
    char filename[CHARSIZE];
 
    printf("Enter the filename that you want to open. /n");
    gets(filename);
 
    convert(filename);
 
    puts(filename);
 
    return 0;   
}
void convert()
{
     int i =0;
 
     while (filename[i] != "\0");
     {
           filename[i] = toupper(filename[i]);
           i++;
     }  
}
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CHARSIZE 101

void convert (char strng[]);

int main()
{
    char filename[CHARSIZE];
    
    printf("Enter the filename that you want to open. /n");
    gets(filename);
    
    convert(filename);
    
    puts(filename);

    return 0;   
}
void convert()
{
     int i =0;
     
     while (filename[i] != "\0");
     {
           filename[i] = toupper(filename[i]);
           i++;
     }  
}

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Re: Converting lowercase to capital

Oct 30th, 2007

Did you read my link first.

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Re: Converting lowercase to capital

Oct 30th, 2007

sorry, I think I was posting when your reply was posted, I am checking it out now.

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Re: Converting lowercase to capital

Oct 30th, 2007

Please do.

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Re: Converting lowercase to capital

Oct 30th, 2007

>>have revised, It still doesnt work exactly though
You need to pass your convert() function the filename because its declared in main() and not visible to convert().

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Re: Converting lowercase to capital

Oct 30th, 2007

I read the link, but dont know how it can help me. I have made a few changes, but cant get the desired result. Here is updated code:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CHARSIZE 101
 
void convert (char filename[]);
 
int main()
{
 
    char filename[CHARSIZE];
 
    printf("Enter the filename that you want to open. /n");
    gets(filename);
 
    convert(filename);
 
    puts(filename);
 
    return 0;   
}
void convert(char* filename)
{
     int i =0;
 
     while (filename[i] != "\0");
     {
           filename[i] = tolower(filename[i]);
           i++;
     }
 
}
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CHARSIZE 101

void convert (char filename[]);

int main()
{

    char filename[CHARSIZE];
    
    printf("Enter the filename that you want to open. /n");
    gets(filename);
    
    convert(filename);
    
    puts(filename);

    return 0;   
}
void convert(char* filename)
{
     int i =0;
     
     while (filename[i] != "\0");
     {
           filename[i] = tolower(filename[i]);
           i++;
     }
     
}

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Re: Converting lowercase to capital

#10

Oct 30th, 2007

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#include <string.h> /* no need for this include */
#include <stdlib.h> /* no need for this include */

void convert (char filename[]); /* function is defined as char *filename not char filename[], even if it works like that */

printf("Enter the filename that you want to open. /n") /* you need \n which is not the same that /n */

 gets(filename); /* forget about gets, use fgets( filename, sizeof filename / sizeof ( char ), stdin ); */

while (filename[i] != "\0"); /* "\0" is a string and is not the same that '\0', which is what you want; futhermore that ending (;) is screwing the program there, remove it */


 filename[i] = tolower(filename[i]); /*  I though you wanted to convert to uppercase, use toupper() for that */