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Oct 30th, 2007

Converting lowercase to capital

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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.

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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theteamdrunk

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Oct 30th, 2007

Re: Converting lowercase to capital

>>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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Oct 30th, 2007

Re: Converting lowercase to capital

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

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Oct 30th, 2007

Re: Converting lowercase to capital

have revised, It still doesnt work exactly though

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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Oct 30th, 2007

Re: Converting lowercase to capital

Did you read my link first.

iamthwee

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Oct 30th, 2007

Re: Converting lowercase to capital

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

theteamdrunk

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Oct 30th, 2007

Re: Converting lowercase to capital

Please do.

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Oct 30th, 2007

Re: Converting lowercase to capital

>>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().

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Oct 30th, 2007

Re: Converting lowercase to capital

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:

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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Oct 30th, 2007

Re: Converting lowercase to capital

(Toggle Plain Text)

#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 */

Last edited by Aia; Oct 30th, 2007 at 8:15 pm.

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