How to check whether the user input is a number in C

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How to check whether the user input is a number in C
bool isNumber(char number[])
{
    int i = 0;

    // Check if it is a negative number
    if (number[0] == '-')
        i = 1;
    for (; number[i] != 0; i++)
    {
        if (!isdigit(number[i]))
		//if (number[i] > '9' || number[i] < '0')
            return false;
    }
    return true;
}
Created Time:2017-08-28 12:08:12  Author:lautturi