求某个范围内的质数
#include<stdio.h>
int main()
{
int c, d, i, j, f = 0;
int t, n = 0;
printf("please input c,d(c>2):\n");
scanf("%ld,%ld", &c, &d);
if (c % 2 == 0)
{
c++;
}
for (i = c; i <= d; i += 2)
{
for (t = 0, j = 3; j <= sqrt(i); j += 2)
{
if (i % j == 0)
{
t = 1;
break;
}
}
if (t != 1)
printf("%d\n", i);
}
return 0;
}
求某个范围内的孪生素数
#include <stdio.h>
#include <math.h>
int main()
{
long c, d, i, j, f = 0;
int t, n = 0;
printf("please input c,d(c>2):\n");
scanf("%ld,%ld", &c, &d);
if (c % 2 == 0)
c++;
for (i = c; i <= d; i += 2)
{
for (t = 0, j = 3; j <= sqrt(i); j += 2)
{
if (i % j == 0)
{
t = 1;
break;
}
}
if (t == 0)
{
if (i - f == 2)
{
printf("(%ld,%ld)\n", f, i);
n++;
}
f = i;
}
}
printf("total=%d\n", n);
return 0;
}
标签:控制,ld,main,int,质数,循环,input,include
From: https://blog.csdn.net/2301_80744520/article/details/136919773