#include <stdio.h>
#include <stdlib.h>
int main()
{
int i = 0, j = 0;
for (i = 100; i <= 200; i++)
{
for (j = 2; j < i; j++)
{
if (i % j == 0)
break;
}
if (j == i)
{
printf("%d \n", i);
}
}
system("pause");
return 0;
}
#include <stdio.h>
#include <stdlib.h>
int main()
{
int i, j;
for (i = 1; i <= 9; i++)
{
for (j = 1; j <= i; j++)
printf("%d * %d = %-4d", i, j, i*j);
printf("\n");
}
system("pause");
return 0;
}
闰年:能被4整除且不能被400整除 或 能被400整除
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
int main()
{
int year, leap;
printf("输1000-2000之间的整数:");
scanf("%d", &year);
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
leap = 1;
else
leap = 0;
if (leap = 1)
printf("%d是闰年\n", year);
else
printf("%d不是闰年\n", year);
system("pause");
return 0;
}