#include<stdio.h>
void func(int bx,int ex,int by,int ey)
{
int addx,addy;
int i;
printf("x=%d",bx);
for(i=bx+1;i<=ex;i++)
{
printf("+%d",i);
}
printf("=%d\n",addx=(ex-bx+1)*(bx+ex)/2);
printf("y=%d",by);
for(i=by+1;i<=ey;i++)
{
printf("+%d",i);
}
printf("=%d\n",addy=(ey-by+1)*(by+ey)/2);
printf("x*y=%d\n",addx*addy);
}
int main(void)
{
int begin_x,begin_y,end_x,end_y;
begin_x=2;
begin_y=4;
end_x=6;
end_y=5;
func(begin_x,end_x,begin_y,end_y);
return 0;
}