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FibonacciSum.java

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import java.io.*;

public class FibonacciSum {

public static void main() throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

System.out.println("NUMBER OF FIBO. TERMS = ");

int n = Integer.parseInt(br.readLine());

System.out.println("Sum of the first " + n + " Fibonacci terms: " + fibonacciSum(n));

}

public static int fibonacciSum(int n) {

if (n <= 0) return 0;

int sum = 0;

int fibo1 = 0, fibo2 = 1;

for (int i = 1; i <= n; i++) {

sum += fibo1;

int next = fibo1 + fibo2;

fibo1 = fibo2;

fibo2 = next;

}

return sum;

}

}