gmp + c++: assign rationals

Reply to gmp + c++: assign rationals on Fri, 10 Sep 2010 16:44:03 GMT

math student — Fri, 10 Sep 2010 16:44:03 GMT

I have initialize a rational and two integers. I want to assign to it different values:
mpq_class a;
int b;
inc c;
if (...){
... calculate b,c;
assign a=b/c;
}
else {
... calculate b,c;
assign a=b/c
}

So I want to assign to a, b/c but not wenn I initialize it but at an other point of the program. How can I do that?

Reply to gmp + c++: assign rationals on Fri, 10 Sep 2010 18:42:37 GMT

math student — Fri, 10 Sep 2010 18:42:37 GMT

you can do it by mpq_class a (b,c) also if you have already defined it by mpq_class a;

Reply to gmp + c++: assign rationals on Sat, 11 Sep 2010 06:29:01 GMT

pumuckl — Sat, 11 Sep 2010 06:29:01 GMT

math student schrieb:

I have initialize a rational and two integers. I want to assign to it different values:
mpq_class a;
int b;
inc c;
if (...){
... calculate b,c;
assign a=b/c;
}
else {
... calculate b,c;
assign a=b/c
}

So I want to assign to a, b/c but not wenn I initialize it but at an other point of the program. How can I do that?

if the implementor of mpq_class has defined an mpq_class::operator=(mpq_class const&), you could assign a temporary object of that class to 'a' and initialize that temporary with b and c:

a = mpq_class(b, c);