Question

用java语言求1！+2！+3！+4！+5！+6！

Answer 1

public class Test
{ public static void main(String[] args){
{
float n,s=0,t=1;
for(n=1;n<=6;n++)
　 {
　 t*=n;
　 s+=t;
　 }
system.out.println("1+2!+3!...+6!=%e\n",s);
}
}

Answer 2

public class Test
{ public static void main(String[] args){
{
int sum=0,a=1;
int i=1;
while(i<=6)
　 {
i+=1;
　 a*=i;
sum+=a;
　 }
system.out.println("1+2!+3!...+6!=",sum);
}
}

Answer 3

int sum=0;
for(i=1;i<=6;i++){
int accu=1;
for(j=1;j<=i;j++){
accu=accu*j;
}
sum=sum+accu;
}