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| function Integer(value){
if(!(this instanceof Integer)){
return new Integer(value);
}
if(value instanceof Integer){
return value;
}
var a = this;
a.originalString = parseFloat(value).toString();
a.pow = a.originalString.indexOf('.');
if(a.pow == -1){
a.pow = a.originalString.length;
}
a.data = a.originalString.replace('.','').split('').map(function(a){return parseInt(a)});
a.negatif = 0;
if(isNaN(a.data[0])){
a.data.shift();
a.pow--;
a.negatif = 1;
}
return a;
}
Integer.prototype.sub = function(value){
return this.add(value,true);
};
Integer.prototype.set = function(data,pow,neg){
var a = this;
a.data = data || [0];
a.pow = pow || 1;
a.negatif = neg || 0;
return a;
};
Integer.prototype.add = function(value,sub){
var a = this, b = Integer(value),
sa = a.negatif, sb = b.negatif,
da = a.data, db = b.data,
la = da.length, lb = db.length,
pa = a.pow, pb = b.pow,
pdiff = pb - pa,
i, compare = a.compare(b);
if(sub){
sb++;
}
if(compare==0 && (sa%2)!=(sb%2) ){
// soustraction lui-même ou même valeur -> return 0
return a.set();
}
if(pdiff>0){
// copy prefix from b
var prefix = db.slice(0, pdiff);
prefix.unshift(0,0);
Array.prototype.splice.apply(da, prefix);
}
if(la < lb){
// copy sufix from b
var sufix = db.slice(la-lb);
sufix.unshift(la+1,0);
Array.prototype.splice.apply(da, sufix);
}
if(compare==-1){
a.negatif=sb;
}
else{
}
for(i=0;i<la && Math.abs(pdiff)+i<da.length;i++){
// add/sub all commun field
if(sa%2 == sb%2){
da[Math.abs(pdiff)+i] += db[Math.max(pdiff,0)+i] || 0;
}
else if(a.negatif%2 == sa%2){
da[Math.abs(pdiff)+i] -= db[Math.max(pdiff,0)+i] || 0;
}
else{
da[Math.abs(pdiff)+i] = (db[Math.max(pdiff,0)+i] || 0) - da[Math.abs(pdiff)+i];
}
}
// set bigger pow
a.pow = Math.max(pa,pb);
// return fixed values
return a.fix();
};
Integer.prototype.fix = function(){
var a = this, da = a.data;
for(i=da.length-1;i>0;i--){
if(da[i]>=10){
da[i] -= 10;
da[i-1]++;
}
else if(da[i]<0){
da[i] += 10;
da[i-1]--;
}
}
if(da[0]>=10){
da[0] -= 10;
da.unshift(1);
a.pow++;
}
if(da[0]<-9){
da[0] += 10;
da.unshift(-1);
a.pow++;
}
if(da[0]<0){
da[0] = Math.abs(da[0]);
a.negatif++;
}
return a;
};
Integer.prototype.compare = function(value){
var a = this, b = Integer(value), i = 0;
if(a==b){
return 0;
}
if(a.pow > b.pow){
return 1;
}
if(a.pow < b.pow){
return -1;
}
var len = Math.max(a.data.length,b.data.length);
for(; a.data[i] == b.data[i] && i<len;i++);
if(a.data[i] > b.data[i] || b.data[i] == undefined){
return 1;
}
if(a.data[i] < b.data[i] || a.data[i] == undefined){
return -1;
}
return 0;
};
Integer.prototype.copy = function(){
var a = this;
return Integer().set(a.data,a.pow,a.negatif);
};
Integer.prototype.mod = function(value){
var a = this, b = Integer(value).copy(), neg = a.negatif;
b.negatif = 0;
a.negatif = 0;
while(a>b){
this.sub(b);
}
a.negatif = neg;
return a;
};
Integer.prototype.toString = function(){
var c = this.data.slice(0);
c.splice(this.pow,0,'.');
return parseFloat((this.negatif%2?'-':'')+c.join(''));
};
writeln = function(){
var a = Array.prototype.slice.call(arguments);
a.push('<br/>');
document.writeln.apply(document,a);
};
var a = -12.311111, b = -12.121111;
writeln( Integer(a).sub(b) );
writeln( a - b );
writeln();
writeln( Integer(5.0).mod(.1) );
writeln( 5.0%.1 ); |
