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eef3e020c2
Migrate tutorial text from individual `directions.txt` files to the main tutorial document. Add some comments to source code to provide anchors for inclusion.
36 lines
857 B
C++
36 lines
857 B
C++
// A simple program that computes the square root of a number
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#include <cmath>
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#include <iostream>
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#include <string>
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#include "TutorialConfig.h"
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// should we include the MathFunctions header?
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#ifdef USE_MYMATH
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# include "MathFunctions.h"
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#endif
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int main(int argc, char* argv[])
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{
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if (argc < 2) {
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// report version
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std::cout << argv[0] << " Version " << Tutorial_VERSION_MAJOR << "."
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<< Tutorial_VERSION_MINOR << std::endl;
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std::cout << "Usage: " << argv[0] << " number" << std::endl;
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return 1;
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}
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double inputValue = std::stod(argv[1]);
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// which square root function should we use?
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#ifdef USE_MYMATH
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double outputValue = mysqrt(inputValue);
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#else
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double outputValue = sqrt(inputValue);
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#endif
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std::cout << "The square root of " << inputValue << " is " << outputValue
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<< std::endl;
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return 0;
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}
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