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//-std=c99 -Wall -Wextra -Wpedantic -Wshadow
 
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
 
int main()
{
 
    FILE *fp;
    char fileName[] = "test_text_file.txt";
 
    fp = fopen(fileName, "r");
 
    if (fp)
    {
        printf("WARNING: file \"%s\" already exists ! Overwrite it ? [Y/N]\n", fileName);
 
        char c = toupper(getchar());
 
        if ( c != 'Y' )
        {
            printf("Not overwriting. Bye !\n");
            fclose(fp);
            return 0;
        }
 
        fclose(fp);
 
    }
 
    fp = fopen(fileName, "w");
 
    if (!fp)
    {
        printf("ERROR: can't open file \"%s\" for writing !\n", fileName);
        return -1;
    }    
 
    fprintf(fp,"%s\n", "some text");
 
    fclose(fp);
 
    printf("INFO: a \"%s\" file has been written (overwritten). Bye !\n", fileName);
 
    return 0;
}