int main(void) {
FILE *p = fopen("matriz.txt","r+");
char *arquivo;
arquivo=(char*)malloc(sizeof(p+1)*sizeof(char));
while (fgets(arquivo,sizeof(arquivo),p)) {
printf(" %s",arquivo );
}
}//END
the matrix content.txt:
3 3 2
1 0
1 2
But the program does not print the contents, I think it misused the memory allocation, because it returns the file size as 3, how to fix that code?
First, the fopen function does not return the file size, see fopen . In your case, you may even notice that you are pointing to a variable of type FILE* .
To do this, you should read the entire file in some way. In this case, there is a function that you can go through the file.
This example is very simple but I believe it will work for you.
int GetFileSize(FILE *f)
{
fseek(f, 0, SEEK_END); // move para o fim do arquivo
size = ftell(f); // pega o ponto em que está
fseek(f, 0, SEEK_SET); // volta para o início do arquivo
}
Just call GetFileSize(p) to receive the file size.
while (fgets(arquivo,sizeof(arquivo),p)) {
printf(" %s",arquivo );
It does not make much sense to allocate memory for the TODO file when you use only each line of it. In your case, you read a line, associating string with the file pointer. You read another, and associate a new string, and do not concatenate it.