Question

8. Write a function is_nneg_float() that checks if string s denotes a non-negative floating point value (not in scientific notation). This function should return True if s contains (at most) one decimal point and one or more digits (and nothing else); and False otherwise. According to this definition an integer should return True. >>> is_nneg_float("2.15") True

>>> is_nneg_float("3.") True

>>> is_nneg_float(".5") True

>>> is_nneg_float("123") True >>> is_nneg_float("-12") False >>> is_nneg_float("1e10") False

Answer 1

def is_nneg_float(n):
    decimalPointCount = 0
    digitsCount = 0
    for x in n:
        if x=='.':
            decimalPointCount += 1
        elif x>='0' and x<='9':
            digitsCount += 1
        else:
            return False
    return decimalPointCount<=1 and digitsCount>=1

# Testing
print(is_nneg_float("2.15"))
print(is_nneg_float("3."))
print(is_nneg_float(".5"))
print(is_nneg_float("123"))
print(is_nneg_float("-12"))
print(is_nneg_float("1e10"))