ex9_01.c

来自「[C语言入门经典(第4版)]整本书的源码！值得推荐！全部是最简单的源码！」· C语言 代码 · 共 33 行

/* Exercise 9.1 A recursive power function */
#include <stdio.h>

double power(double x, int n);


int main(void)
{
  for(double x = 2.0 ; x<= 5.0; x += 0.5)
  {
    for(int n = -4 ; n<5 ; n++)
      printf("The value of %.2lf raised to the power %d is %.4lf\n", x, n, power(x,n));
    printf("\n");
  }

  return 0;
}

/* Function to raise x to the power n.*/
double power(double x, int n)
{
  if(n < 0)
  {
    n = -n;
    x = 1.0/x;
  }

  if(n == 0)
    return 1.0;

    return x*power(x,n-1);
}