Vòng lặp:
1 đoạn lệnh (khối lệnh)nào đó lặp đi lặp lại nhiều lần cho đến khi 1 điều kiện xác định nào đó không còn thỏa mãn.

for(initialize counter; relational expression; re-evaluation counter)
	(khởi tạo biến đếm; điều kiện; tăng/giảm biến đếm)
{
	statements
}
Initialize conter is an assignment statement that sets the loop control variable, before entering the loop
Relational expression determines when the loop will exit. It's the expression of the counter
Re-evaluation counter defines how the loop control variable changes, each time the loop is executed

E.g:
	int i;
	for(i=0;1<10000;i++)
		printf("\nA1205m")

The scope of the for loop can be extended by including more than one initializations or increment expressions in the for loop specification
for(1 , 2);

The for loop will be termed as a nested for loop when it is written as follows
for(i=1;i<max1;i++)
{
.
.
for(j=0;j<=max2;j++)
{
.
.
}
.
.
}

E.g:
int i,j;
for(i=0;i<100;i++)				// 1i=100j loop
	for(j=0;j<100;j++)			//	total of 100^2
		printf("\nsumthin");

-----------------------------------------------------------------------------------------

THUC HANH

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

int main()
{
 int i,dem=0,j,n,k;
/*
// for(i=0;i<10;i++)
// for(i=12;i>=0;i-=2)
 for(i=20;i>=0;i--)
 if(i%2!=0)
//                      printf("\n%d",i);
{
                      for(j=0;j<dem;j++)
                      printf("   ");
//                      printf("\t");
                      printf("%d\n\n",i);
                      dem++;
}
//                      printf("\na1205m");

 getch();
*/
/*  printf("\nEnter some shit: ");
  scanf("%d",&n);
  for(i=0;i<n;i++)
  {
   for(j=0;j<=i;j++)
                    printf("*");
   printf("\n");
     }
*/

//Triagle STUFF
/*  printf("\nEnter sum shit:");
  scanf("%d",&n);
  for(i=n;i>0;i--)
  {
  for(j=0;j<i;j++)
  printf("*");
  printf("\n");
  }
  for(i=0;i<n;i++)
  {
  for(j=0;j<=i;j++)
  printf("*");
  printf("\n");
  }
*/

//Square triagle
/*printf("\ninsert shit ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
for(k=0;k<n-1-i;k++)              //Cong thuc in tam giac vuong: n-1-i
printf(" ");
for(j=0;j<=i;j++)
printf("*");
printf("\n");
}
*/

//TAM GIAC CAN
printf("\ninsert shit ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
for(k=0;k<n-1-i;k++)
printf(" ");
for(j=0;j<2*i+1;k++)
printf("*");
printf("\n");
}
     getch();
}


                                         //tam giac can, so le: 2*n+-1