How can I export output to a C text file?

Question

I want to pass the program output to a . txt file, as I would?

Answer 1

To redirect the output of a program to a file just call the right way from the terminal/command line:

Windows:

programa.exe > arquivo.txt

Unix

./programa > arquivo.txt

Analogously can use < to use a file such as stream input, or as if it were what you would write directly on the console to input:

programa < arquivo_entrada.txt

You can even combine the two and use an input and output file:

programa < arquivo_entrada.txt > arquivo_saida.txt

Answer 2

If you want to pass the FULL output of the program to the file, you can do as follows:

Windows:

meuprograma.exe > arquivo.txt

Unix/Linux:

./meuprograma > arquivo.txt

Note: Only one ">" will replace everything inside the file, and two ">>" will add. Both will create a file if it does not exist!

But, if you want to pass the output from within your program, from a variable for example, you can do as follows:

char Str[100];
FILE *arq;

arq = fopen("arquivo.txt", "wt"); //abre arquivo ou cria um

if (arq == NULL){ //verifica se ocorreu erro
   printf("Erro ao abrir o arquivo\n");
   return;
}

strcpy(Str, "testando"); //passa a plavra para variavel
resultado = fputs(Str, arq); //grava variavel no arquivo

if (resultado == EOF){ //verifica se ocorreu erro
   printf("Erro na Gravacao\n");
}
fclose(arq); //fecha o arquivo

I don’t know if I can help, but I hope so!