Loop
For
  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5. 	for(int i = 0; i < 10; i++)
  6. 	{//start block
  7. 		printf("Hello World!\n");
  8. 	}//end block
  9.  
  10. 	// the braces can be ignored if there is only one line of code
  11. 	for(int i = 0; i < 10; i++)
  12. 		printf("Hello World!\n");
  13.  
  14. 	return 0;
  15. }
  16.
  • break, provides an early exit from for, while, and do ... while, and switch
    1. #include <stdio.h>
    2.  
    3. int main()
    4. {
    5. 	for(int i = 0; i < 10; i++)
    6. 	{
    7. 		if(i == 6) break;
    8. 		printf("%d\n", i);
    9. 	}
    10.  
    11. 	return 0;
    12. }
    13.
  • continue, skip the rest statements of the current iteration, applies only to loops, not to switch
    1. #include <stdio.h>
    2.  
    3. int main()
    4. {
    5. 	for(int i = 0; i < 10; i++)
    6. 	{
    7. 		if(i == 6) continue;
    8. 		printf("%d\n", i);
    9. 	}
    10.  
    11. 	return 0;
    12. }
    13.
  • Nested For Loop
    1. #include <stdio.h>
    2.  
    3. int main()
    4. {
    5. 	for(int i = 1; i < 10; i++)
    6. 	{
    7. 		for(int j = 1; j < 10; j++)
    8. 			printf("%3d * %3d = %4d", i, j, i*j);
    9.  
    10. 		printf("\n");
    11. 	}
    12.  
    13. 	return 0;
    14. }
    15.
    While
    1. #include <stdio.h>
    2.  
    3. int main()
    4. {
    5. 	int i = 10;
    6.  
    7. 	while (i > 0)
    8. 	{
    9. 		printf("%d\n", i);
    10. 		i--;
    11. 	}
    12.  
    13. 	return 0;
    14. }
    15.
    Do ... While
    1. #include <stdio.h>
    2.  
    3. int main()
    4. {
    5. 	int i = 10;
    6.  
    7. 	do
    8. 	{
    9. 		printf("%d\n", i);
    10. 		i--;
    11. 	}while ( i > 0 );
    12.  
    13. 	return 0;
    14. }
    15.