穷举法找出1至100的质数 c++

while循环

#include <iostream>

#include <cmath>

using namespace std;

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main() {

int i,j,k,flag;

i=2;

while(i<=100){

flag=1;

k=sqrt(i);

j=2;

while(j<=k){

if(i%j==0){

flag=0;

break;

}

j++;

}

if(flag)

cout<<i<<"是质数."<<endl;

i++;

}

return 0;

}

do while循环

#include <iostream>

#include <cmath>

using namespace std;

int main( ){

int i,j,k,flag;

i=2;

do{flag=1;

k=sqrt(i);

j=2;

do{if(i%j==0)

{flag=0;

break;

}

j++;

}

while(j<=k);

if(flag)

cout<<i<<"是质数。"<<endl;

i++ ;

}

while(i<=100);

return 0;

}

for循环

#include <iostream>

#include <cmath>

using namespace std;

int main( ){

int i,j,k,flag;

for(i=2;i<=100;i++)

{

flag=1;

k=sqrt(i);

for(j=2;j<=k;j++)

{

if(i%j==0)

{flag=0;

break;

}

}

if(flag)

cout<<i<<"是质数。"<<endl;

}

return 0;

}

出现问题：中英转换时分号用成中文的分号