输出字符串中个位数小于六的数

#include <stdio.h>
void PRINT(long s)
{
  FILE *out;
  printf("s=%ld\n",s);
  if((out=fopen("result.dat","w+"))!=NULL)
  {
   fprintf(out,"s=%ld",s);
   fclose(out);
  }
}
main()
{
	int a[50]={3421,3834,3124,3349,2842,2384,3459,2338,2348,7234,6482,4823,4829,5234,8449,2042,7383,2438,4592,8343,8342,7234,9432,8432,
	8842,8812,4324,7724,7345,9134,7442,7524,6732,7752,7692,1384,2343,8249,7235,7731,7525,6259,2385,7525,6323,7525,7534,8535,7563,7534};

    /*考生在此设计程序*/
int i,sum=0;
for(i=0;i<50;i++)
	{
		if(a[i]%10<6)
		sum=sum+a[i];
	}



	PRINT(sum);
}