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How to convert a string variable that consists of maximum 100 char to big int ?

My code:

 long long int x; string s="11111111111111111111111111111111"; x=atoll(s.c_str()); cout<<x;
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  • What is the maximum value that can be stored in such a "long long int" value? How many characters does the maximum value that can be represented have (in the desired base encoding)? That will be a limiting factor for any standard integer type.. and it's well below "100 char". Commented Jul 16, 2017 at 6:25
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    Hint: log10(2 ^ 128) is approximately 38 Commented Jul 16, 2017 at 6:36

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You need to use a bignum library, like GNU MP aka GMP or libcrypto.

Since in a 64-bit environment most compiler use 64 bits for a long long int, you can't even reach near 100 decimal digits with a long long.

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