68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/**************************************************************************
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*
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* complx.cpp - Complex Number example program.
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*
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* $Id: complx.cpp 550991 2007-06-26 23:58:07Z sebor $
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*
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***************************************************************************
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*
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* Copyright 1994-2006 Rogue Wave Software.
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*
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**************************************************************************/
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#include <complex>
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#include <utility>
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#include <iostream>
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#include <examples.h>
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typedef std::complex<double> dcomplex;
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// Return roots of a quadratic equation.
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std::pair<dcomplex, dcomplex>
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quadratic (dcomplex a, dcomplex b, dcomplex c) {
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dcomplex root = std::sqrt(b * b - 4.0 * a * c);
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a = a * 2.0;
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return std::make_pair ((-b + root) / a, (-b - root) / a);
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}
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int main () {
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dcomplex a(2, 3);
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dcomplex b(4, 5);
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dcomplex c(6, 7);
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std::pair<dcomplex, dcomplex> ans = quadratic(a, b, c);
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std::cout << "Roots are " << ans.first << " and "
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<< ans.second << std::endl;
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return 0;
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}
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