#include<stdio.h>
int main()
{ 
     int  i , number ,  sum ; 
     printf ( "请输入10个整数\n");
     sum = 0 ; 
     i = 1 ;   
     while ( i < = 10 )
     {   
        scanf ("%d" , &number);     
        sum + = number;      
        i = i + 1 ;  
     }  
     printf ("%d\n", sum); 
     return 0;
}

#include<stdio.h>
int main()
{
	int i,n;
	double sum,score;
	printf("请输入一批0~100的整数\n");
	scanf("%lf",&score);
	sum=0;
	while (scanf("%lf",&score),score>=0)
	{
		sum += score;
	}
	printf("%.2f",sum);
	return 0;
 } 

#include<stdio.h>
int main()
{
	int n,digits;
	printf("请输入一个整数n:\n");
	scanf("%d",&n);
	if (n==0)
	  digits=1;
	while(n!=0)
	  {
	  	n/=10;
	  	digits++;
	  }
	printf("%d\n",digits);
	return 0;

 }