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User contributions / Re: Big integer arithmetic library
« Last post by cosh on Today at 10:21:16 PM »Hi, fellows
I finished a big integer calculator.
You guys may download it here: https://github.com/coshcage/pbint/blob/main/Samples/05-24-24_13-09.c
The calculator supports +-*/^(power) and brackets.
I also paste this code here:
I finished a big integer calculator.
You guys may download it here: https://github.com/coshcage/pbint/blob/main/Samples/05-24-24_13-09.c
The calculator supports +-*/^(power) and brackets.
I also paste this code here:
Code: [Select]
/*
* Name: 05-24-24_13-09.c
* Description: A big integer calculator.
* Author: cosh.cage#hotmail.com
* License: GPLv3.
*/
#include <stdio.h>
#include <string.h>
#include "pbm.h"
#define MAXLEN 100
P_BINT CatchFirstNumber();
P_BINT CalcBrackets();
P_BINT CalcAddtional();
P_BINT CalcAdvanced();
P_BINT CalcPrimary();
char * expr;
P_BINT CalcPrimary()
{
P_BINT x, y = NULL, r;
int c;
r = pbkCreateBint(0);
x = CalcAdvanced(expr);
c = expr[0];
while ('+' == c || '-' == c)
{
++expr;
y = CalcAdvanced(expr);
if ('+' == c)
{
pbkAddBint(r, x, y);
pbkMoveBint(x, r);
}
else if ('-' == c)
{
pbkSubtractBint(r, x, y);
pbkMoveBint(x, r);
}
c = expr[0];
}
if (expr[0] == ')')
++expr;
pbkDeleteBint(r);
if (NULL != y)
pbkDeleteBint(y);
return x;
}
P_BINT CalcAdvanced()
{
P_BINT x, y = NULL, r, k;
int c;
r = pbkCreateBint(0);
k = pbkCreateBint(0);
x = CalcAddtional(expr);
c = expr[0];
while ('*' == c || '/' == c)
{
++expr;
y = CalcAdvanced(expr);
if ('*' == c)
{
pbkMultiplyBint(r, x, y);
pbkMoveBint(x, r);
}
else if (c == '/')
{
pbkDivideBint(r, k, x, y);
pbkMoveBint(x, r);
}
c = expr[0];
}
pbkDeleteBint(r);
pbkDeleteBint(k);
if (NULL != y)
pbkDeleteBint(y);
return x;
}
P_BINT CalcAddtional()
{
P_BINT x, y, r;
r = pbkCreateBint(0);
x = CalcBrackets(expr);
if ('^' == expr[0])
{
_ub n;
++expr;
y = CalcAddtional(expr);
n = GETABS(pbkBintToIb(y));
pbmBintPower(r, x, n);
pbkDeleteBint(y);
pbkDeleteBint(x);
return r;
}
return x;
}
P_BINT CalcBrackets()
{
if ('(' == expr[0])
{
++expr;
return CalcPrimary(expr);
}
else
{
return CatchFirstNumber(expr);
}
}
P_BINT CatchFirstNumber()
{
size_t i;
P_BINT r;
P_BNUM t;
char szT[2] = { 0 };
char szTar[MAXLEN] = { 0 };
r = pbkCreateBint(0);
t = pbkCreateBnum(10);
for (i = 0; expr[0] != 0 && i < MAXLEN; ++expr, ++i)
{
if (expr[0] >= '0' && expr[0] <= '9')
{
szT[0] = expr[0];
strcat(szTar, szT);
}
else
{
pbkDecimalSzToBnum(t, szTar);
pbkDecimalBnumToBint(r, t);
pbkDeleteBnum(t);
return r;
}
}
pbkDecimalSzToBnum(t, szTar);
pbkDecimalBnumToBint(r, t);
pbkDeleteBnum(t);
return r;
}
int main(int argc, char ** argv)
{
char szExpr[MAXLEN] = { 0 };
while (EOF != scanf("%s", szExpr))
{
P_BINT r;
P_BNUM t;
expr = szExpr;
t = pbkCreateBnum(10);
r = CalcPrimary();
pbkBintToDecimalBnum(t, r);
printf("= ");
pbkPrintBnum(t);
pbkDeleteBnum(t);
printf("\n");
}
}
