Fast and efficient way to read a space separated file of numbers into an array?

Question

I need a fast and efficient method to read a space separated file with numbers into an array. The files are formatted this way:

4 6
1 2 3 4 5 6
2 5 4 3 21111 101         


        

Answer 1

Read the file a character at a time. If it's whitespace, start a new number. If it's a digit, use it.

for numbers with multiple digits, keep a counter variable:

int counter = 0;
while (fileOpen) {
    char ch = readChar(); // use your imagination to define this method.
    if (isDigit(ch)) {
        counter *= 10;
        counter += asciiToDecimal(ch);
    } else if (isWhitespace(ch)) {
        appendToArray(counter);
        counter = 0;
    } else {
        // Error?
    }
}

Edited for clarification.