FILE *f = fopen(c, "r");
char buffer[40];
float max = FLT_MIN;
float min = FLT_MAX;
while (fgets(buffer, 40, f)) {
    if (buffer[strlen(buffer) - 1] == '\n')
        buffer[strlen(buffer) - 1] = '\0';

    String str = String(buffer);
    float value = StrToFloat(str);
    if (value > max) {
        max = value;
    }
    if (value < min) {
        min = value;
    }

    float sum = max + min;

    Memo2->Lines->Add(str);
    Edit1->Text = sum;
    Edit2->Text = max;
    Edit3->Text = min;
}
fclose(f);