2-100的质数
#include <iostream>
using namespace std;
int main ()
{
int i, j;
for(i=
2; i<
100; i++) {
for(j=
2; j <= (i/j); j++)
if(!(i%j))
break;
if(j > (i/j))
cout << i <<
" 是质数\n";
}
return 0;
}
switch的用法
#include <iostream>
using namespace std;
int main ()
{
char grade =
'D';
switch(grade)
{
case 'A' :
cout <<
"很棒!" << endl;
break;
case 'B' :
case 'C' :
cout <<
"做得好" << endl;
break;
case 'D' :
cout <<
"您通过了" << endl;
break;
case 'F' :
cout <<
"最好再试一下" << endl;
break;
default :
cout <<
"无效的成绩" << endl;
}
cout <<
"您的成绩是 " << grade << endl;
return 0;
}
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