求第一题第二三四题代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
void main()
{
    int ret = 0;
    int i = 0;
	int rnd = 0;
	int level = 10;
	srand((unsigned int)time(NULL));
	ret = rand()%90;
	printf("Ganestart!\n");
	while(1)
	{
		printf("请输入一个数:");
		scanf("%d",&rnd);
		if(rnd>ret){
			printf("Too big! \n");	
		}else if(rnd<ret){
			printf("Too small! \n");	
		}else{
			break;
		}
		level--;
		if(level<=0){
			printf("You Failed! The aumber is r");
			exit(0);	
		}
	}
	switch(level){
		case 10:
			printf("Congratulation! Your gessind Lerel is S");
			break;
		case 9:
			printf("Congratulation! Your gessind Lerel is A");
			break;
		case 8:
			printf("Congratulation! Your gessind Lerel is B");
			break;
		case 7:
			printf("Congratulation! Your gessind Lerel is C");
			break;
		case 6:
			printf("Congratulation! Your gessind Lerel is D");
			break;
		case 5:
		case 4:
		case 3:
		case 2:
		case 1:
		case 0:
			printf("Congratulation! Your gessind Lerel is E");
			break;	
	}
	
	return 0;
}