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#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> double f4(int n); int main() { int n; printf("Enter the number of elements: "); scanf("%d", &n); double sum = f4(n); printf("Sum of even elements: %.2lf\n", sum); return 0; } double f4(int n) { double num; if (n == 0) return 0; // base case scanf("%lf", &num); if (n % 2 == 0) { // if the position is even return num + f4(n - 1); // add the number and call recursively with n-1 } else { return f4(n - 1); // call recursively with n-1 } }
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