Compare digits in character string

Question

Please I am trying to find built in function that compares not the alphabet but the digits in two character array. for example

if in char array1[50] there is a number 500 and in char array2[50] there is a number 100 so I should be able to compare which one is bigger, in this case 500 is bigger which is array1 so what is the built in function for this. Please help me.

In my program I have used string and its a big program so I cant change it to string now. — user3215228, Mar 22 '14 at 02:11
I don't understand why can't you use string, you can just initialize `std::string array_string(array1[0], array1[50])` and use `compare` and then return to char array after the process — Claudiordgz, Mar 22 '14 at 02:14
@Claudiordgz Maybe OP wants to compare the numbers represented by the strings, not the strings — Niklas B., Mar 22 '14 at 02:21

score 1 · Accepted Answer · answered Mar 22 '14 at 02:35

1

prepend(add '0' at the beginning) '0' so both strings become same in length, then you can use strcmp(), or std::string::compare() depending on your data type.

answered Mar 22 '14 at 02:35

wacky6

135
3

score 0 · Answer 2 · answered Mar 22 '14 at 02:15

0

Use boost::lexical_cast:

if (boost::lexical_cast<int>(array1[50]) > boost::lexical_cast<int>(array2[50]))
{
    // array1[50] bigger than array2[50]
}

answered Mar 22 '14 at 02:15

Paul Evans

27,315
3
37
54

Compare digits in character string

2 Answers2