The data type of String in VB is string, and the data types of decimal are Float (single precision floating-point decimal) and Double (double precision floating-point decimal).

The Val(S) function is used to convert a string variable composed of numbers into a number variable, where s stands for a string composed entirely of numbers. For example, the string a="39.3245 ". To convert this character into decimal, just use b=Val(a).

The Round(M, n) function needs to keep the specified number of decimal places. M stands for decimal places, and n stands for reserved decimal places. The function of this function is to round m and keep n decimal places. For example, M=39.32455, then Round(M, 4)=39.3246.