Bit Integers in C

Question

I am just trying to do a problem in C that may give us 64 bit integers. It cannot support in displaying such big number. So what can i do?

#include<stdio.h> #include<string.h> #include<math.h> #include<stdlib.h> int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ long int a,b,n,c; scanf("%ld %ld %ld",&a,&b,&n); n-=2; while(n--){ c=(b*b)+a; a=b; b=c; } printf("%ld",c); return 0; }

Use type long long which is at least 64-bit.

chux
– chux

2015-07-21 02:15:07 +00:00
Commented Jul 21, 2015 at 2:15 — chux
– chux, Commented Jul 21, 2015 at 2:15

Dmitriy Kalugin-Balashov · Accepted Answer · 2015-07-21 02:14:22Z

2

You should use %lld.

scanf("%lld %lld %lld",&a,&b,&n); printf("%lld",c);

But long int is not an 64bit integer. Use long long int or int64_t from inttypes.h.

answered Jul 21, 2015 at 2:14

Dmitriy Kalugin-Balashov

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5 Comments

M.M Over a year ago

To be clear, a, b, c and n must have type long long int in order to use %lld. There is a different format specifier for int64_t.

Bill Lynch Over a year ago

long int might be a 64 bit integer, but it isn't required to be one.

autistic Over a year ago

The "%lld" format specifier tells scanf or printf that the units are long long int, yes. Don't use "%lld" in conjunction with int64_t; use "%"PRId64 for printf or "%"SCNd64 for scanf.

too honest for this site Over a year ago

int64_t may be defined in stdint.h, not inttypes.h. The latter just contains the format specifiers for the types defined in stdint.h.

leopragi Over a year ago

1002992 integer length......if 123 has a length of 3....can i display upto that extent

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