Write a COMPLETE and an EFFICIENT C program that should ask the user to enter the number of terms n from 1 to 30. Validate the user input. Your code should repeatedly display “Incorrect Value, Please Try Again”, till the user enters the correct value. On having correct input, the program should display the following series upto n terms as: 1000 + 998 + 995 + 991 + 986 + 980 + 973+… Your code should also display the average of all these values (upto n terms). Sample output: (Suppose the user enters n as 9) 1000 + 998 + 995 + 991 + 986 + 980 + 973 + 965 + 956 average = 982.666687

Answer

#include <stdio.h> int main() { int n; // Prompt the user to enter the number of terms and validate the input do { printf("Enter the number of terms (from 1 to 30): "); scanf("%d", &n); if (n < 1 || n > 30) { printf("Incorrect value, please try again.\n"); } } while (n < 1 || n > 30); // Display the series int sum = 0; // sum of the terms for (int i = 0; i < n; i++) { int term = 1000 - (2 * i) - (5 * (i / 3)); printf("%d ", term); sum += term; } printf("\n"); // Calculate and display the average float average = (float) sum / n; printf("average = %.6f\n", average); return 0;