Question

Write a C++ program that takes two numbers from the command line and perform and arithmetic operations with them. Additionally your program must be able to take three command line arguments where if the last argument is 'a' an addition is performed, and if 's' then subtraction is performed with the first two arguments. Do not use 'cin' or gets() type functions. Do not for user input. All input must be specified on the command line separated by blank spaces (i.e. use the argv and argc input parameters).

Example1: Exercise1_1234567.exe    10   2    a

which should return 10 + 2 = 12, i.e. the last (and only) line on the console will be:

12

Answer 1

//C++ code for command line arguments computation

#include<string.h>
#include<iostream>
using namespace std;
int main(int argc, char **argv)
{
int n1,n2,sum,difference;
//convert command line input strings to integers
n1=atoi(argv[1]);
n2=atoi(argv[2]);
if(argc==3)
{
sum=n1+n2;
cout<<"sum="<<sum;
}
else if(argc==4)
{
  
if(strcmp(argv[3],"a")==0)
{
sum=n1+n2;
cout<<"sum="<<sum;
}
else if(strcmp(argv[3],"s")==0)
{
difference=n1-n2;
cout<<"Difference="<<difference;
}
else
cout<<"invalid operation, enter a or s:";
return 0;
}
}