A student needs help (FILE)

[JoaoHRoch]

I'm having trouble in this exercise here.

Code software that, from an original text file, generate another file with the text content in upper case.

For exemple:

entrence:

luke
tom
alex

outings:

LUKE
TOM
ALEX


My code so far:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    char variable;
    FILE *file, *file2;
    file = fopen("arquivo.txt","r");
    if (file == NULL)
        printf("error the file was not open\n");
    else {
         while ( (variable = fgetc(file)) != EOF)
              putchar(file);
              printf("its ok");
    }




  return 0;
}

[laserlight]

I suggest that you start by reading from a file, then printing the contents of that file to standard output. Then, you can modify your code to print the contents of that file to standard output, such that the alphabetic contents of the file are in uppercase. Finally, you modify your code again to open the second file for writing, then having the printing be done to that output file instead of standard output.

[snorem]

The easiest way to change letters from upper to lower case, or vice versa, is to use ascii values.