Complete the program, sum.c, by translating the algorithm given there into C. This program sums the numbers given to it as input. You should terminate the input with the end-of-file character.

int main()

{

/* Initialize the sum */

/* Get the first input */

/* While there is more input */

/* Accumulate the sum */

/* Get the next input */

/* Print the results */

}

Copy your sum.c file into a new file, avg.c. Modify the algorithm and then the code to print the average of the input instead of the sum. Here's an example run:

 Enter an integer value: 10 Enter an integer value: 20 Enter an integer value: 30 Enter an integer value: [control-D] The average of 3 input values is 20.000000 

A more interesting type of average is a weighted average. A weighted average is computed by summing up a series of weight/value pairs, and then dividing the result by the sum of the weights. Copy the avg.c program into weight.c and modify it to read and compute a weighted average. Here's an example run:

 Enter a weight/value pair: 20 90 Enter a weight/value pair: 30 80 Enter a weight/value pair: 50 60 Enter a weight/value pair: [control-D] The weighted average of 3 input values is 72.0