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google search
Google search results:
1: https://www.geeksforgeeks.org/c-plus-plus-gq/references-gq/
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2: https://www.sanfoundry.com/tough-c-plus-plus-programming-questions-argument-passing/
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3: https://www.sanfoundry.com/advanced-c-programming-questions-arithmetic-operators/
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4: https://www.includehelp.com/cpp-tutorial/function-returning-reference.aspx
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5: https://onecompiler.com/cpp/3w5tzjmg7
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6: https://www.sololearn.com/Discuss/951659/what-is-the-output-of-this-code
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7: https://usermanual.wiki/Pdf/C20how20to20program20solution20manual.1303732338/help
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8: https://manualzz.com/doc/28729253/introduction-to--scientific-programming-and-simulation-us...
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9: https://www.khanacademy.org/math/ap-calculus-ab/ab-differentiation-1-new/ab-2-4/v/differentiability-at-a-point-algebraic-not-differentiable
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10: https://nyu-cdsc.github.io/learningr/assets/simulation.pdf
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11: http://www.hmwu.idv.tw/web/R/R-exercise-v2020_07.pdf
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