The operation causes an overflow

The operation does not cause an overflow

The result obtained is equal to +20

Another result is obtained

The result obtained is equal to -1

We can’t know

1 time

2 times

buf+i by &buf[i] in the write() statement

char buf* by char buf[255]

char buf* by char buf[2222]

char buf* with char **buf at the beginning

./read-write displays the content of the file toto.txt on the standard output

echo "toto" > ./read-write displays toto on the standard output

./read-write < toto.txt displays the content of the file toto.txt on the standard output

int main(int argc, char∗ argv[]){...}

int main(int argc, char∗∗ argv){...}

void main(){...}

int main(){...}

int main(int argc){...}