create a pointer and use increament operator to read the string. This should be maintained in a loop till the end of string. And for every next character make a check using if(*ptr == ' ') then your counter, which counts the number of words, should not increase.
This is pretty simple. Just take your string (which depending on how your using strings, will be a char* or an std::string), and iterate through each char until you reach the '\n' new line character.
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