baitap.cpp

examples C,c++ codes programs

# include <stdio.h>
# include <conio.h>


int tong(int s)
{

	int n,i;
	n = 0;
	for(i=1;i<=s;i++)
	{
		n=n+i;
	}
	return n;
}
void main()
{
	clrscr();
	int n,s;
	printf("nhap n:");
	scanf("%d",&n);
	s= tong(n);
	printf("tong =%d",s);

 getch();
}