int main(void)
{
 int c, countSpaces = 0;

printf("Type sentence:n");

do
{
  c = getchar();
  if (c == ' ')
    countSpaces = countSpaces + 1;
}
while (c != 'n');

printf("Sentence contains %d Spaces.n", countSpaces);

return 0;
}

if (c != EOF)
    countSpaces = countSpaces + 1;
}
while (c != 'n');

printf("Sentence contains %d Spaces.n", countSpaces - 1);