可爱的C语言程序。....兔子问题...斐波那契数列

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输入月数(少于40): 40

M.1:         1M.2:         1M. 3:         2
M. 4:         3M. 5:         5M. 6:         8M. 7:        13
M. 8:        21M. 9:        34M.10:        55M.11:        89
M.12:       144M.13:       233M.14:       377M.15:       610
M.16:       987M.17:      1597M.18:      2584M.19:      4181
M.20:      6765M.21:     10946M.22:     17711M.23:     28657
M.24:     46368M.25:     75025M.26:    121393M.27:    196418
M.28:    317811M.29:    514229M.30:    832040M.31:   1346269
M.32:   2178309M.33:   3524578M.34:   5702887M.35:   9227465
M.36: 14930352M.37: 24157817M.38: 39088169M.39: 63245986
M.40: 102334155Press any key to continue

源程序

#include<stdio.h>

main()
{
long fn1,fn2,fn3;
int i,n;

    printf("输入月数(少于40): ");
scanf("%d",&n);
if(n<1)n=1;

printf("/n");
fn1=fn2=1;
printf("M.1:%10ld",fn1);
if(n>1)
  printf("M.2:%10ld",fn2);
for(i=3; i<=n;i++)
{
  fn3=fn1+fn2;
  if(i%4==0)printf("/n");
        printf("M.%2d:%10ld",i,fn3);
  fn1=fn2;
  fn2=fn3;
}

}