Example of command line parameters in C language

When executing C programs, some values can be passed to them from the command line. These values are calledCommand Line Parameters, and many times they are important to your program, especially when you want to control the program from the outside rather than hardcoding these values within the code.

Command line parameters are processed using main() function parameters, whereargcrefers to the number of parameters passed,argv[]is an array of pointers to each parameter passed to program. The following is a simple example that checks if there are any arguments provided from the command line and takes appropriate action -

Sample Code

#include  int main( int argc, char *argv[] ) { if( argc == 2 ) { printf("The argument supplied is %s
", argv[1]); } else if( argc > 2 ) { printf("Too many arguments supplied.
"); } else { printf("One argument expected.
"); } }

Output

$./a.out testing The argument supplied is testing

Output

$./a.out testing1 testing2 Too many arguments supplied.

Output

$./a.out One argument expected

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