In C language, command line parameters refer to parameters passed to the program through the command line when the program is running.

Executable instructions that perform operating system tasks are called commands. These commands are issued from the operating system prompt.

The parameters associated with the command are as follows:

• argc - Argument count.

• argv - Argument vector.

argc - It holds the total number of arguments passed from the command prompt.

argv - It is a pointer to a character string array containing the names of the arguments.

For example:

c: |> sample. Exe hello how are you
   arguments

Here,

• argc = 5

• argv[0] = sample.exe

• argv[1] = hello

• argv [2] = how

• argv[3] = are

• argv[4] = you

Example

Here is the C program for command line arguments:

#include<stdio.h>
main ( int argc, char *argv[ ]){
   int i;
   clrscr( );
   printf (" no. of arguments at command p = %d", argc);
   printf (" arguments given at prompt are </p><p>");
   for ( i = 1; i <argc; i++)
      printf ("%s</p><p> ", argv[i]);
   getch( );
}

Output

Using command line arguments Run the C program:

• Compile the program

• Run the program

• Go to the command prompt and Enter as shown below.

c:|> sample.exe hello how are you.
No. of arguments given at prompt is = 5
Arguments given at command prompt are:
hello
How

Are
You

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