Question

Write a program that reads a positive integer N, where N is greater than 1 and prints the value of the floating-point value SUM where SUM is the results of the following series.

SUM = 1/1! + 2/2! + 3/3! + 4/4! + ... N/N!
Note that your program should print the message “Sorry, bad N”” if N is <=1, and keep reading user input until the user enters a valid value for N.
Also, note that all division operations in your program must be floating-point operations.

using c programming,

Answer 1

#include <stdio.h>

int main() {
    int n, i;
    double sum = 0, f = 1;
    printf("Enter a positive integer for n: ");
    scanf("%d", &n);
    while (n <= 1) {
        printf("Sorry, bad N\n");
        printf("Enter a positive integer for n: ");
        scanf("%d", &n);
    }
    for (i = 1; i <= n; ++i) {
        f *= i;
        sum += i/f;
    }
    printf("Sum = %lf\n", sum);
    return 0;
}