In C/C++, int argc and char *argv are used to receive command line parameters. Among them, int argc represents the number of command line parameters, and char *argv is an array of pointers used to store the string of each command line parameter.

argc represents the parameter count and argv represents the parameter value. These are the variables passed to the main function when it starts executing. When we run a program, we can provide parameters to the program, such as −

$ ./a.out hello

Example

where hello is a parameter of the executable file. You can access it in your program. For example,

#include<iostream>
using namespace std;
int main(int argc, char** argv) {
   cout << "This program has " << argc << " arguments:" << endl;
   for (int i = 0; i < argc; ++i) {
      cout << argv[i] << endl;
   }
   return 0;
}

When you compile and run this program something like −

$ ./a.out hello people

output

This will give the output-

This program has 3 parameters

C:\Users\user\Desktop\hello.exe
hello
people

Please note that the first parameter is always the location where the executable file is executed.

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