try yourself |run program

#include <stdio.h> 
#include <conio.h> 
void main(){
 int arr[]={10,20,30,20,10,50,20};
 clrscr();
 printf("\n This is a 1-d array program.");
 printf("\n value of arr[1] = %d ",arr[1]);
 getch();
}

Program Output

This is a 1-d array program.
value of arr[1] = 20