Question

用C语言 求答案1!-2!+3!。。。。+49!-50!

Answer 1

#include<stdio.h>
main()
{
double i,j=1,t=1,s=0;
for(i=1;i<=50;i++,j*=-1)
{
t*=i;
s+=t*j;

}
printf("%.0f",s);

}
定义别的类型不够大...所以就用double就可以了

Answer 2

#include<stdio.h>
main()
{
double i,j=1,t=1,s=0;
for(i=1;i<=50;i++,j*=-1)
{
t*=i;
if(i%2==1)
s+=t*j;
else
s-=t*j;

}
printf("%.0f",s);

}
希望能采纳，谢谢

Answer 3

var i:integer;
begin
write(1);
for i:=2 to 50 do
begin
for i:=2 to i do
write(i*i-1);
end;
end.