Makefile

all:
    gcc -o gmp_hello_world gmp_hello_world.c -lgmp -m64

clean:
    rm gmp_hello_world

gmp_hello_world.c

/*
 * GMP Hello World on OS X 10.5
*/
#include <gmp.h>
#include <stdio.h>

int main() {
  mpz_t add_total1, add_total2, sub_total1, sub_total2, mul_total1, mul_total2;
  mpz_t num1, num2;

  // Initialize variables
  mpz_init_set_str(num1, "345192567923875922375736284875732", 10);
  mpz_init_set_str(num2, "937929298382994742939293857584837", 10);
  mpz_init(add_total1);
  mpz_init(add_total2);
  mpz_init(sub_total1);
  mpz_init(sub_total2);
  mpz_init(mul_total1);
  mpz_init(mul_total2);

  // Do arithmetic
  mpz_add(add_total1, num1, num2);
  mpz_add_ui(add_total2, num1, 10);
  mpz_sub(sub_total1, num1, num2);
  mpz_sub_ui(sub_total2, num1, 10);
  mpz_mul(mul_total1, num1, num2);
  mpz_mul_ui(mul_total2, num1, 10);

  // Display results
  gmp_printf("Add Total 1: %Zd\n", add_total1);
  gmp_printf("Add Total 2: %Zd\n", add_total2);
  gmp_printf("Subtract Total 1: %Zd\n", sub_total1);
  gmp_printf("Subtract Total 2: %Zd\n", sub_total2);
  gmp_printf("Multiply Total 1: %Zd\n", mul_total1);
  gmp_printf("Multiply Total 2: %Zd\n", mul_total2);

  // Free space
  mpz_clear(num1);
  mpz_clear(num2);
  mpz_clear(add_total1);
  mpz_clear(add_total2);
  mpz_clear(sub_total1);
  mpz_clear(sub_total2);
  mpz_clear(mul_total1);
  mpz_clear(mul_total2);

  return 0;
}