习题(经济发展数据的文本存储) — 数据复制， 减少不必要的数据录入工作

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vector<int> years;
for (auto i=1960;i<=2021;i++)
    years.push_back(i);

vector<double> gdp = {  //单位：亿美元
	597.16,500.57,472.09,507.07,597.08,704.36,767.20,728.82,708.47,797.06,
    926.03,998.01,1136.88,1385.44,1441.82,1634.32,1539.40,1749.38, 
    1495.41,1782.81,1911.49,1958.66,2050.90,2306.87,2599.47,3094.88,3007.58, 
    2729.73,3123.54,3477.68,3608.58,3833.73,4269.16,4447.31,5643.25,7345.48, 
    8637.47,9616.04,10290.43,10939.97,12113.47,13393.96,14705.50,16602.88,   
    19553.47,22859.66,27521.32,35503.43,45943.07,51017.03,60871.64,75515.00, 
    85322.30,95704.07,104756.83,110615.53,112332.76,123104.09,138948.18,
    142799.38,147227.31,177271.82
};

  C++