因为n==1满足(n%2!=0)
#includeint JG(int n);main(){int n,i,sum;for(i=1;;i++){scanf("%d",&n);sum=JG(n);printf("%d\n",sum);}return 0;}int JG(int n){int sum=0;while(n!=1){if(n%2==0)n=n/2;elsen=n*3+1;n=n;sum=sum+1;}return sum;}