티스토리 뷰


#include <stdio.h>

int main(void)
{

 int input=0, count=0, calc, j, pn;

    printf("2이상의 정수를 입력하세요 : ");
    scanf("%d",&input);


    for (calc=2;calc<=input;calc++)
        {
            pn=1;
            for(j=2;j<calc;j++)
            {

                if ((calc%j)==0)
                {
                    pn=0;
                    break;
                }
            }

                if (pn==1)
                {
                    printf("%5d ",calc);
                    count++;
                    if(count==5)
                    {
                        printf("\n");
                        count=0;
                    }
                }

        }

return 0;

}


------------------------------------------------------------------------

실행)

2이상의 정수를 입력하세요 : 99
    2     3     5     7    11
   13    17    19    23    29
   31    37    41    43    47
   53    59    61    67    71
   73    79    83    89    97


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