The document discusses different types of loops in C programming including for loops, while loops, and do-while loops. It provides examples of using each loop type to output multiplication tables from 1 to 12. It also shows an example of a nested for loop that allows a user to input a number and prints the multiplication table for that number from 1 to 24.

1. การทาซ้า for loop
ทาการเปิดงานเก่าขึ้นมาก่อน

2. #include <stdio.h>
void main()
{
char menu;
int counter;
for (counter=1;counter<=4;counter++)
{
printf(" n please insert your order:");
scanf(" %c",&menu);
switch(menu)
{
case'p':printf("papaya salad");

3. break;
case't' :printf("tomyam kung");
break;
case'i' :printf("padthai");
break;
case'l':printf("labmoo");
break;
default: printf("n tryagain");
}
}
getch();
return 0;
}

4. การทาสูตรคูณ
#include <stdio.h>

5. void main()
{
int counter;
for(counter=1;counter<=12;counter++)
{
printf("2 x%d=%d",counter,counter*2);
}
printf("ngoodbye");
getch();
return0;
}

6. Loop While
#include <stdio.h>
void main()
{
int counter;
counter=1;
while (counter<=12)
{
printf("2 x%d=%dn",counter,counter*2);
counter++;
}
printf("ngoodbye");

7. getch();
return 0;
}

8. Do while
#include <stdio.h>
void main()

9. {
int counter;
counter=1;
do
{
printf("2 x%d=%dn",counter,counter*2);
counter++;
}while (counter<=12);
printf("goodbye");
getch();
return 0;
}

10. ลูกค้าทาการกรอกค่าเอง

11. # include <stdio.h>
void main()
{
int counter,counter1,number;
for(counter1=1;counter1<=5;counter1++)
{
printf("please insert to number:");
scanf("%d",&number);
for(counter=1;counter<=24;counter++)
{
printf("%dx%d=%dn",number,counter,number*counter);
}

12. }
printf("goodbyen");
getch();
return 0;
}