Thread: Help with code

Hello

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define DATA_FILE "data3.bin"

int main(int argc, char *argv[])
{{

        FILE *fp;
        char* buff;
        if( ( fp=fopen(DATA_FILE, "wb") )== NULL)
        {
            printf("Klaida sukuriant  faila %s\n",DATA_FILE);
            exit(1);
        }
        printf("Iveskite teksta (Ivedimo pabaiga ctrl+z):\n");
        scanf("%c", &buff);
        while(!feof(stdin))
        {
            scanf("%c", &buff);
            fwrite(&buff,sizeof(char),1,fp);
        }
        fclose(fp);
    }
    FILE *fp;
    if ( ( fp=fopen(DATA_FILE, "rb+") )== NULL)
    {
        printf("Klaida atidarant faila %s\n",DATA_FILE);
        exit (1);
    }
    char* buff;
	buff = (char*) malloc (sizeof(char));
    while ( fread(buff,sizeof(char),1,fp) == 1)
    {
		if (*buff >= 'a' && *buff <= 'z')
		{
			*buff-=32;
            fseek(fp,-1,SEEK_CUR);
            fwrite(buff,sizeof(char),1,fp);
			fflush(fp);
		}
    }
    fclose (fp);

    return 0;
}

here is code is changing all small letters to big one, how to make that this code changes large letters to small ones, i tried to use strlwr function but it's don't work.
thank you for help
forgot to say that it's read all from bin file

Find the part of the code that turns them from small to big, and switch it so it changes from big to small. You should probably get rid of the -=32 piece and just use tolower or toupper from ctype.h instead.


Quzah.