 
 
 
2.4.11  Transform a string into a number : expr
Use expr, the parser with a string representing a number.
- 
For integers, enter the string representing the integer without
leading 0 for basis 10, with prefix 0x for basis 16,
0 for basis 8 or 0b for basis 2.
Input :
expr("123") Output :123 Input :expr("0123") Output :83 Because : 1*82+2*8+3=83
Input :expr("0x12f") Output :303 Because : 1*162+2*16+15=303
- For decimal numbers, use a string with a . or e inside.
 Input :expr("123.4567") Output :123.4567 Input :expr("123e-5") Output :0.00123 
- Note that expr more generally transforms a string 
into a command if the command exists.
 Input :expr("a:=1") Output :1 Then, input :a Output :1 
 
 
