Question

Problem: Write a program that behaves as described below.If the first command-line argument after the program name (argv[1]) is “--help”, print the usage information for the program. If that argument is not “--help”, you are to expectargv[1]and subsequent arguments to be real numbers(C, integer, float, or double types)in formats acceptable to the sscanf()function of the C library or strings of ASCII chars that are not readable as real numbers. You are to read the numbers, count them and calculate the sum, minimum value, maximum value and average of those numbers, and if there are non-numbers write these to stdout as they are encountered, one per line. If there are no command-line arguments other than the program name(arc equals 1), print a suitable error message and the usage information. If no numbers are among the command line arguments, print a suitable error message and the usage information following the non-numeric arguments present. Naming: Your submitted file is to be named p2.c.Output: Your program’s output must be to stdout and of one of the four formats following, assuming argc and argv are the usual parameters for main()and where <program_name>is argv[0], and rnumis any real number in decimal format.If argv[1]is “--help”, display the following.Usage: <program_name><program_name> --help display this usage material.<program_name> <arg> [<arg> ...]calculate the sum, minimum, maximum and mean of the real number command line arguments. Non-numeric values will be echoed to the standard output device, one per line, with the numeric results printed following the non-numeric lines. If real numbers are among the command line arguments, echo the non-numeric command-line arguments to stdout, then display the following as indicated in the above usage text. For the sequence provided the following values were calculated.Found = <count of numbers>Sum = <sum>Min = <min>Max = <max>Mean = <mean>Where the values indicated in angle-brackets are the corresponding calculated values. Note that you are NOT to replicate the angle-brackets. For example, the entire string <sum>is to be replaced with the sum.If there are no arguments following argv[0](argcequals 1), display the following.*** ERROR: No command line arguments were found.Usage: <program_name><program_name> --helpdisplay this usage material.
<program_name> <arg> [<arg> ...]calculate the sum, minimum, maximum and mean of the real number command line arguments.Non-numeric values will be echoed to the standard output device, one per line, with the numeric results printed following the non-numeric lines. The error message and usage information displayed when arguments are present but no numbers are found should be of a similar format. Note that argv[0]is the program name, which should be used in generating the usage and error messages. In the above, <program_name>is to be replaced by the name of the program as run, without any filename extension, while <arg> [<arg> ...]is to be displayed, not replaced. You are to obtain the name of the program from argv[0], the first command-line argument. Preferably you should pare the path from the name, but this is not required. How to pare the path from the name will be discussed, though.

This must be written in C, not C++.

Answer 1

The required c++ program is given below. The explanations are provided as comments:

#include<stdio.h>
#include<stdlib.h>

//fuction to print error messages
void errorMessage(int i)
{
//if no arguements are passes
if(i == 0)
{
printf("\nerror: no arguements passed");
}
//if no real numbers are passed
if(i == 1)
{
printf("\nerror: no real numbers passed");
}
}

//function to print usage material
void helpMessage()
{
printf("\n Usage: main.c");
printf("\n main.c --help");
printf("\n\t display this usage material");
printf("\n main.c <arg> [<arg> ...]");
printf("\n\t diplay the sum, minimum, maximum and mean of the real");
printf("\n\tnumber command line arguements. Non-numeric values will");
printf("\n\techoed to the standard output device, one per line, with");
printf("\n\tthe numeric results printed following the non-numeric lines.");
}

///function to print no. of real numbers, sum
//minimum, maximum and mean real numbers
void printVals(int c, double sum, double min, double max, double mean)
{
printf("\nFor the sequence provided, the following values were calculated:");
printf("\nFound = %d", c);
printf("\nSum = %f", sum);
printf("\nMin = %f", min);
printf("\nMax = %f", max);
printf("\nMean = %f", mean);
}

//funtion to check if a string is a real number
bool isReal(char c[])
{
double n;
int b;
b = sscanf(c, "%f", &n);
if(b==1) return true;
return false;
}

//function to convert a string into real number
double real(char c[])
{
double n;
sscanf(c, "%f", &n);
return n;
}

int main(int argc, char *argv[])
{
int count=0, i;
double min = 99999.0, max = -99999.0, sum=0.0, mean;
//if no arguements are give
if(argc == 1)
{
errorMessage(0);
return 0;
}
//if --help is in the arguments
if(argv[1] == "--help")
{
helpMessage();
return 0;
}
for(i = 1; i<argc; i++)
{
//if the argument is not a real number
if(!isReal(argv[i])) printf("%s\n", argv[i]);
//if the argument is a real number
else
{
count++;
if(min>real(argv[i])) min = real(argv[i]);
if(max<real(argv[i])) max = real(argv[i]);
sum+=real(argv[i]);
}
}
mean = sum/count;
//if there are no real numbers
if(count == 0)
{
errorMessage(1);
return 0;
}
else
{
//to print the required values
printVals(count, sum, min, max, mean);
}
return 0;
}

That concludes the solution. If you have any doubts or you need more information, please reach out to me in the comment section.