plete the C++ programs lastline.c and longestline.c, where each program should: - Take a single command-line argument representing the input file name, - Process the input file, and - Write to standard outpu

Q: setprecision (n) : when used in conjunction with fixed, set the number of digits after the decimal…

A: Below is the code and sample output:

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A: Required:

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A: #include<iostream>#include<fstream>#include<string>using namespace std;int main(){…

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A: Below is the required code and sample output:

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A: Actually, program is a executable software that runs on a computer.

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A: code is given in next step

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A: The answer is

Q: Prompts the user for 4 one-word items and their corresponding prices in US dollars Compute the total…

A: Step 1: Start Step 2: Declare the local variables that will be used to store the Item Names and…

Q: sum and difference of two values) Write the C++ code for a program that allows the user to enter two…

A: #include <iostream> using namespace std; int main() { int x, y, sum, sub; cout << "Enter…

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A: The C++ code is given below with output screenshot

Q: names

A: First make 3 text files that each one includes 10 names and also make one text file that includes…