Basic Syntax

Loop

For

#include <stdio.h>

int main()
{
	for(int i = 0; i < 10; i++)
	{//start block
		printf("Hello World!\n");
	}//end block

	// the braces can be ignored if there is only one line of code
	for(int i = 0; i < 10; i++)
		printf("Hello World!\n");

	return 0;
}

break, provides an early exit from for, while, and do ... while, and switch

#include <stdio.h>

int main()
{
	for(int i = 0; i < 10; i++)
	{
		if(i == 6) break;
		printf("%d\n", i);
	}

	return 0;
}

continue, skip the rest statements of the current iteration, applies only to loops, not to switch

#include <stdio.h>

int main()
{
	for(int i = 0; i < 10; i++)
	{
		if(i == 6) continue;
		printf("%d\n", i);
	}

	return 0;
}

Nested For Loop

#include <stdio.h>

int main()
{
	for(int i = 1; i < 10; i++)
	{
		for(int j = 1; j < 10; j++)
			printf("%3d * %3d = %4d", i, j, i*j);

		printf("\n");
	}

	return 0;
}

While

#include <stdio.h>

int main()
{
	int i = 10;

	while (i > 0)
	{
		printf("%d\n", i);
		i--;
	}

	return 0;
}

Do ... While

#include <stdio.h>

int main()
{
	int i = 10;

	do
	{
		printf("%d\n", i);
		i--;
	}while ( i > 0 );

	return 0;
}