#include <stdio.h>

int main()
{
    void hanoi(int n,char one,char two,char three);
    int m;
    printf("input the number of diskes:");
    scanf("%d",&m);
    printf("The step to move %d diskes:\n",m);
    hamoi(m,'A','B','C');

return 0;
}

void hanoi(int n, char one, char two, char three)

{
void move(char x,char y);

if(n==1)
    move(one,three);
else
    {
    hanoi(n-1,one,three,two);
    move(one,three);
    hanoi(n-1,two,one,three);
    }
}

void move(char x,char y)
{
    printf("%c->%c\n",x,y);
}

hamoi(m,'A','B','C');

这个hamoi写错了吧，应该是hanoi

楼上正解

还缺少函数原型。要在主函数前先声明自定义函数。初学C语言，还望多多指教！