给你个完整的:
#include<stdio.h>
int isprim(int n)
{
int i;
if (n<2) return 0;
for (i=2; i*i<=n; ++i)
if (n%i==0) return 0;
return 1;
}
int isssp(int n)
{
if (!isprim(n)) return 0;
while (n/10)
if (!isprim(n/=10)) return 0;
return 1;
}
int main()
{
int i;
int cnt=0;
int maxp;
printf("从100-9999的超级素数有:\n");
for (i=100; i<10000; ++i)
{
if (isssp(i))
{
++cnt;
maxp=i;
printf("%8d", i);
if (cnt%5==0)
printf("\n");
}
}
printf("\n总共有:%d个\n", cnt);
printf("最大的是:%d\n", maxp);
return 0;
}
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