请学长们帮助解决1个C语言问题
小弟刚学C，作业中有道编程题不会做，请学长们写一下，就快要交了。

输入个人信息，然后打印出来一段欢迎的话。程序的运行要求达到如下示例的效果：
Please input your name:
Tom
Please input your class:
F06032032
How many students in your class?
30
Hello, Tom! Welcome to SJTU! You are in class F06032032. You have 29 classmates.


[解决办法]
我晕,geniuszw(),我的那个是好用的,我都试过了,你看懂了就好好学习吧

main()
{
char name[10];
char cla[20];
int number;
printf( "%s ", "Please input your name: ");
gets(name);
printf( "%s ", "Please input your class: ");
gets(cla);
printf( "%s ", "How many students in your class? ");
scanf( "%d ",&number);
printf( "%s%s%s%s%s%d%s ", "Hello, ",name, "! Welcome to SJTU! You are in class ",cla, ". You have " ,number-1, " classmates. ");
}