How can we convert a string to int for very large integer values?

Question

I have used the function atoi to convert character strings to int and it\'s working fine but when I gave

num = atoi (argv[1]) ;

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Answer 1

If you want to handle seriously very large numbers then you need a library like GMP.

GMP stands for GNU Multiple Precision and it is a BigNum library, which means it has code to handle integers bigger than 32 bits or 64 bits. It can handle as many bits as you have RAM.

To convert a string into an integer you would use the GMP function mpz_set_str()