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功能：编写函数求3!+6!+9!+12!+15+18!+21!.------------------------------------------------*/ #includ功能：编写函数求3!+6!+9!+12!+15+18!+21!.------------------------------------------------*/#include void wwjt(); float sum(int n){//}main
功能：编写函数求3!+6!+9!+12!+15+18!+21!.------------------------------------------------*/ #includ
功能：编写函数求3!+6!+9!+12!+15+18!+21!.
------------------------------------------------*/
#include
void wwjt();
float sum(int n)
{
//
}
main()
{
printf("this sum=%e\n",sum(21));
wwjt();
}
void wwjt()
{
FILE *IN,*OUT;
int i;
float o;
IN=fopen("in.dat","r");
if(IN==NULL)
{
printf("Read FILE Error");
}
OUT=fopen("out.dat","w");
if(OUT==NULL)
{
printf("Write FILE Error");
}
fscanf(IN,"%d",&i);
o=sum(i);
fprintf(OUT,"%f\n",o);
fclose(IN);
fclose(OUT);
}

功能：编写函数求3!+6!+9!+12!+15+18!+21!.------------------------------------------------*/ #includ功能：编写函数求3!+6!+9!+12!+15+18!+21!.------------------------------------------------*/#include void wwjt(); float sum(int n){//}main
sum = 1;
for(i = 3; i < 16; i = i +3)
{
for($a = $i; $a = 1; $a--)
{
$sum *= $a;
}
}