#include< stdio.h>
int main()
{
 int ps;
 
 printf("Enter your password: ");
 scanf("%d",&ps);
 
 switch(ps)
 {
  case 2000:
  printf("--WELCOME--");
  break;
  
  default: 
printf("-INCORRECT PASSWORD-");
 }
 getch();
}

Program Explanation

Step 1 : Include header files (#include< stdio.h> and #include< conio.h>).

Step 2 : Start with main function with return type.

Step 3 : parenthesis to start and end the program { }.

Step 4 : declare variables with data type i.e, 'ch' is an integer type so we use "char" data type.

Step 5 : Use output function printf() to print the output on the screen.

Step 6 : Use input function scanf() to get input from the user.

Step 7 : here, we have check password is correct or incorrect using switch case, Enter your password: . we can enter 2000. it was go to case 2000. then the statement was right. then print "--welcome--". otherwish , print "-INCORRECT PASSWORD-"

Step 8 : using getch() function to hold the screen.