c语言。

Question

Write a program to calculate the Fibonacci sequence• The i-th element of the Fibonacci sequence is defined as follows.公式请看图 Ex)011235813
Fibonacci sequence• Input 1, input another numberto calculate the Fibonacci sequence• Input 2, show the Fibonacci sequence • Input 3, initialization• Input 4, terminate the program

Answer 1

 void PrintMenu()
{
    printf("*************\n");
    printf("1. Calculate\n");
    printf("2. Show it!\n");
    printf("3. Initialize\n");
    printf("4. Quit\n");
    printf("*************\n");
    printf("Input : ");
}

int main()
{
    char a;
    int b = 0;
    int i;
    int Fx = 1;
    int Fxx = 0;
    while(true)
    {
        PrintMenu();
        a = getchar();  
        getchar();
        switch(a)
        {
        case '1':
            printf("Input the number : ");
            scanf("%d",&b);
            getchar();
            break;
        case '2':           
            for(i=0;i<b;i++)
            {
                if(i == 0)
                    printf("%d ",Fxx);
                else if(i == 1)
                    printf("%d ",Fx);
                else
                {
                    printf("%d ",Fx+Fxx);
                    int temp = Fx;
                    Fx += Fxx;
                    Fxx = temp;
                }
            }
            printf("\n");
            Fx = 1;
            Fxx = 0;
            break;
        case '3':
            b = 0;
            break;
        case '4':
            return 0;
        }
    }
    return 0;

}