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C/C++ code:
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int n1(int x)
{
printf("in the n(1) is: %d\n",x);
if(x <= 1) return x;
return x * n1(--x);
}

int n2(int x)
{
printf("in the n(2) is: %d\n",x);
if(x <= 1) return x;
return x * n2(x - 1);
}

int main()
{
int r1 = n1(7);
printf("The r1 Value is: %d\n",r1);

printf("\n");

int r2 = n2(7);
printf("The r2 Value is: %d\n",r2);
getch();
/*system("pause");*/
}



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¶øn2ÊÇ 1 * 2 * 3 * 4 * 5 * 6 * 7¡£


C/C++ code:
return x * n1(--x);
return x * n2(x - 1);


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µ±°Ñ n1 µÄ ·µ»ØÖµ¸ÄΪ£º
C/C++ code:
return (x--) * n1(x);

---

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C/C++ code:
return (x--) * n1(x);

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