这怎么做呀，请指导一下

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"=600 #left

int main(){
    int a=0; // how many number i have print
    int begin, end;
    scanf("%d, &d", &begin, &end);
    for (int num = begin; num <= end; num++) { 
      for(int i=2;i<num;i++){
          if(num%i==0){
              a++;  // 素数个数加1
              printf("i");
              if ( a % 5 = 0) 
                printf(" ");
              else
                printf("\n");
      }
    return 0;
}