以下这段代码输出结果在113到127之间为何换了这么多行？如图：
#include"stdio.h"
#include"math.h"
#include"stdlib.h"
int main(void){
    int a,n,i,b;
    b=0;
    for(a=2;a<=1000;a++){
                         if(b%10==0)     printf("\n");                                    
                         n=sqrt(a);
                         for(i=2;i<=n;i++){
                                          if(a%i==0)
                                          break;
                                          }
                         if(i>n){
                                 printf("%d ",a);
                                 b++;
                                 }
                         }
    system("pause");                     
    return 0;
    }

把if(b%10==0)   printf("\n");放在b++后面就可以了，当a为素数，b被10取整时，执行换行后，这样就避免a取到下一个非素数时又执行换行，因为此时b的值没有增加。