system function in c

What is system() in c programming?

system function in c is used to run Shell commands which cannot be directly executed by the c program.

This function is defined in stdlib.h header file.

Prototype

int system(char const *COMMAND);

Return value

It returns status of the command or -1 on error.

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Example program for system() in c

#include<stdio.h>
#include<stdlib.h>
int main()
{
  if(system(NULL)==0)
   printf("command processor is not present \n");
  else
    system("ls");
  return 0;
}

Output

Code explanation

The system() executes the shell command “ls”, if it is present on your system.

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