ED - grava frase no arquivo de texto

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

#ifdef WIN32
    #include <conio.h>
    #define LIMPA_TELA system("cls")
#else
    #include <ncurses.h>
    #define LIMPA_TELA system("clear")
#endif

int main()
{
    int i;
    char frase[]="Sistema Operacional GNU/Linux";
    FILE *fp = fopen("saida.txt","wt");

    for(i=0; frase[i]!='\0';i++)
        fprintf(fp,"%c",frase[i]);
    fclose(fp);
    printf("arquivo gravado\n");

    system("pause");
    return 0;
}