In Java programs, the simplest way to give input is to pass in the values along the command line while executing the program. This program finds the average of n numbers. The input given in the command line is assigned to the arg[ ] array as strings. To know the number of inputs, arg.length is used. Each element in the arg[ ] array is converted into an integer using the Integer.parseInt( ) function where Integer is a predefined wrapper class. If the input is a floating-point value then use Double.parseDouble() function to convert the command line string values to the corresponding floating-point values.
Note: The program uses the DecimalFormat class function format( ) to format the decimal output to two decimal places. This DecimalFormat class is defined in the java.text package. Hence the first line of the program imports this package.
Program
class Average
{
public static void main(String arg[])
{
double sum=0,avg;
int n=arg.length;
DecimalFormat df = new DecimalFormat("#.##");
for(int i=0;i<n;i++)
sum=sum+Integer.parseInt(arg[i]);
avg=sum/n;
System.out.print("The average of the "+n+" numbers = ");
System.out.println(df.format(avg));
}
}
OUTPUT
>java Average 3 5 8 4 6 6 7 8
The average of the 8 numbers = 5.88
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