Linux and C

Define the extended Fibonacci numbers, F as follows Fo 0 Therefore, for example, F3-F2+F1 2 F.3-F.1-F21-(-1) 2 Write a program that will calculate the nh element of such an extended Fibonacci sequence. For example, assuming that your executable program was called efib and that the shell prompt is "bash-4.4, interaction with your program might be as follows: bash-4.4$ /efib Enter a number: 0 F (0) is 0 bash-4.4$ /efib Enter a number: 1 F(1) is 1 bash-4.4$./efib Enter a number:1 F(-1) is 1 bash-4.4$ /efib Enter a number: 6 F(6) is 8 bash-4.4$ ./efib Enter a number:9 F(-9) is 34 bash-4.4$./efib Enter a number: 10 F(-10) is -55 bash-4.4$