large_number_example.c

/**
 * Large numbers example using built-in data types
 *
 * Author:
 *     Kolby H. <[email protected]>
 *
 * Published:
 *     November 24, 2017
 * 
 * Usage:
 *     For numbers up to about a quintillion
 *     (1,000,000,000,000,000,000) or (1.0 x10^18).
 * Limits:
 *     The limitation is based on using a maximum of 64 bits.
 *
 * Reference:
 *     ISO/IEC 9899:TC3
 *     <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf>
 *
 * See also:
 *     "C data types" on Wikipedia
 *     <https://en.wikipedia.org/wiki/C_data_types>
 *
 * compiled using:
 *     gcc -o example large_number_example.c
 *
 * output should look like the following:
 *     # ./example 
 *     long long int min: -9223372036854775808 
 *     long long int max: 9223372036854775807 
 *     unsigned long long int min: 0 
 *     unsigned long long int max: 18446744073709551615
 */

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <limits.h>


int main(int argc, char* argv[]) {
    /**
     * Signed long long int
     * values can range from −9,223,372,036,854,775,807
     *                    to +9,223,372,036,854,775,807
     */ 
    long long int lli_num;

    lli_num = INTMAX_MIN;  // −9,223,372,036,854,775,807
    printf("long long int min: %lld\n", lli_num);

    lli_num = INTMAX_MAX;  //  9,223,372,036,854,775,807
    printf("long long int max: %lld\n", lli_num);

    /**
     * Unsigned long long int
     * values can range from 0
     *                    to +18,446,744,073,709,551,615
     */ 
    unsigned long long int llu_num;

    llu_num = 0;
    printf("unsigned long long int min: %llu\n", llu_num);

    llu_num = UINTMAX_MAX;  // 18,446,744,073,709,551,615
    printf("unsigned long long int max: %llu\n", llu_num);
    
    return 0;
}