How can i change the base 2 to base 10?

Question

for example the input is:11001
and the output is:25
please guide me with c++

Answer 1

http://www.cplusplus.com/forum/beginner/181908/
Base-10 to Base-2 Conversion - C++ Forum - Cplusplus.com

Answer 2

Basically all numbers is an array read left to right:
e.g. in int 1031 = 1x10^3 + 0x10^2 + 3x10^1 + 1x10^0
To get the individual digits:
(1031/10^3)%10,(1031/10^2)%10,(1031/10^1)%10, (1031/10^0)%10
Same is true for binary:
e.g. 11001 = 1x2^4 + 1x2^3 + 0x2^2 + 0x2^1 + 1x2^0
Then you need to convert whatever number you have to a string.
Pseudo code on string N:
X base to base 10:
Base =X;
Num=0;
Tmp=0;
Tmpchar=‘0’;
For I=0; I < N.length; I++ {
Num=Num*X
Tmp = int (N[i]-‘0’) // doesn’t work past base 10;
Num=Num+Tmp
}
Base 10 # to baseX string:
Num
String s =“”;
TmpNum
While Num>0{
TmpNum=Num% X
Num = Num / X
s = TmpNum+s;
}
Rough implementation with outside references:
https://code.sololearn.com/cqtlOGCgM7U0/?ref=app

Answer 3

My code got down voted, so any opinion as to why?
And how do you feel about downvoting?
https://www.sololearn.com/Discuss/857886/?ref=app