Answer:
The cpp program to print US presidential years is given.
#include <iostream>
using namespace std;
int main()
{
// variable to hold presidential election year declared
int elec_year;
// variable to hold presidential election year initialized to 1792
elec_year=1792;
// the value displayed on the console output
std::cout << "The U.S. presidential election years from 1792 to present day are listed. " << std::endl;
// loop executes till year is less than or equals 2020
do
{
// initial value is printed
std::cout << elec_year << std::endl;
// value is incremented by 4
elec_year = elec_year + 4;
}while(elec_year<=2020);
return 0;
}
OUTPUT
The U.S. presidential election years from 1792 to present day are listed.
1792
1796
1800
1804
1808
1812
1816
1820
1824
1828
1832
1836
1840
1844
1848
1852
1856
1860
1864
1868
1872
1876
1880
1884
1888
1892
1896
1900
1904
1908
1912
1916
1920
1924
1928
1932
1936
1940
1944
1948
1952
1956
1960
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
2012
2016
2020
Step-by-step explanation:
The program works as described.
1. An integer variable, elec_year, is declared and initialized with the first US presidential year value, 1792.
2. Inside the do-while loop, the variable, elec_year, is first printed to the console followed by a new line inserted using, endl.
3. The variable, elec_year, is then incremented by 4.
4. The do-while loop continues till the value of the variable, elec_year, does not exceeds the current year, 2020.
5. The program ends with a return statement since main() has return type int.
6. Only one variable is used in the program.
7. The program consists of only main() method since cpp is not completely object oriented programming language.
8. The same program, if written in object oriented programming language like java or c# will be written inside a class and executed through main() method.