// 注意包含的头文件应该是用尖括号,这里只是为让其能显示
#include "stdio.h"
#include "vector"
using namespace std;
int main()
{
vector v;
unsigned long n;
bool PrimeNumber; // 素数标记
unsigned long numPrime; // 素数个数
FILE * fp;
fp = fopen("in.txt","r"); // 打开输入文件
fscanf(fp,"%d",&n); // 读取数据并将数据保存到vector容器中
while(!feof(fp))
{
v.push_back(n);
fscanf(fp,"%d",&n);
}
fclose(fp); // 关闭输入文件
fp = fopen("out.txt","w"); // 打开输出文件
for(long i = 0;i<v.size();i++)
{
fprintf(fp,"0至%d的素数:",v[i]);
numPrime = 0;
for (long j = 2; j <= v[i]; j++)
{
PrimeNumber = true;
for (long k = 2;k<j;k++)
{
if(j%k==0)
{
PrimeNumber = false;
break;
}
}
if(PrimeNumber)
{
numPrime++;
fprintf(fp,"%d,",j);
}
}
fprintf(fp,"\r素数个数为:%d\r\r",numPrime);
}
fclose(fp);
v.clear();
return 0;
}
输入文件:
2
3
10
72
83
59
输出文件:
0至2的素数:2,
素数个数为:1
0至3的素数:2,3,
素数个数为:2
0至10的素数:2,3,5,7,
素数个数为:4
0至72的素数:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,
素数个数为:20
0至83的素数:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,
素数个数为:23
0至59的素数:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,
素数个数为:17