How to Make a Loop Skip the Rest of if Statements and Start Again

In every programming language, thus too in the C programming linguistic communication, there are circumstances were you want to do the aforementioned thing many times. For example you want to print the aforementioned words ten times. You could type ten printf function, but it is easier to utilise a loop. The only thing you have to do is to setup a loop that execute the aforementioned printf part ten times.
At that place are three bones types of loops which are:

• "for loop"
• "while loop"
• "do while loop"

The for loop

The "for loop" loops from one number to another number and increases past a specified value each fourth dimension.
The "for loop" uses the following structure:

                          for (Showtime value; go on or end condition; increment value)      		statement;                      

Look at the instance below:

                          #include<stdio.h>            int primary() 	{      		int i;      		for (i = 0; i < 10; i++)      		{           		printf ("Hi\n");          		printf ("Earth\northward");      		}      	render 0; 	}

Note: A single instruction can be placed backside the "for loop" without the curly brackets.
Note: For those who don't know printf or need to know more than about printf format specifiers, then first a wait at our printf C language tutorial.

Let's await at the "for loop" from the example: We outset start by setting the variable i to 0. This is  where nosotros start to count. Then we say that the for loop must run if the counter i is smaller then ten. Last we say that every cycle i must be increased by one (i++).

In the example we used i++ which is the same as using i = i + i. This is chosen incrementing. The teaching i++ adds 1 to i. If you want to subtract i from i you tin apply i--. It is also possible to use ++i or --i. The difference is is that with ++i (prefix incrementing) the one is added before the "for loop" tests if i < 10. With i++ (postfix incrementing) the one is added after the test i < x. In example of a for loop this make no divergence, but in while loop test it makes a difference. Simply before we await at a postfix and prefix increase while loop example, we first look at the while loop.

The while loop

The while loop can be used if you don't know how many times a loop must run. Here is an example:

                          #include<stdio.h>  	int main()  	{     		int counter, howmuch;      		scanf("%d", &howmuch);     		counter = 0;     		while ( counter < howmuch)     		{           		counter++;           		printf("%d\n", counter);     		}     		render 0; 	}                      

Let's accept a look at the example: First you must always initialize the counter before the while loop starts ( counter = ane). Then the while loop will run if the variable counter is smaller and then the variable "howmuch". If the input is ten, then 1 through 10 will be printed on the screen. A last thing you accept to remember is to increase the counter inside the loop (counter++). If yous forget this the loop becomes infinitive.

Every bit said before (after the for loop example) information technology makes a difference if prefix incrementing (++i) or postfix incrementing (i++) is used with while loop. Take a look at the following postfix and prefix increment while loop example:

                          #include<stdio.h>  	int main(void) { 		int i; 	 		i = 0; 		while(i++ < 5) { 			printf("%d\n", i); 		} 		printf("\n"); 		i = 0; 		while(++i < 5) { 			printf("%d\n", i); 		} 		return 0; 	}                      

The output of the postfix and prefix increment instance volition expect similar this:

i++ will increment the value of i, merely is using the pre-incremented value to test confronting < 5. That's why nosotros get 5 numbers.
++i volition increment the value of i, but is using the incremented value to test against < v. That'south why we get 4 numbers.

The do while loop

The "exercise while loop" is nigh the aforementioned as the while loop. The "do while loop" has the post-obit form:

                          do 	{     		practise something; 	} 	while (expression);                      

Practise something first then test if nosotros have to go on. The result is that the loop always runs in one case. (Because the expression test comes afterward). Accept a expect at an example:

                          #include<stdio.h>  	int master() 	{      		int counter, howmuch;      		scanf("%d", &howmuch);      		counter = 0;      		do      		{           		counter++;           		printf("%d\n", counter);      		}      		while ( counter < howmuch);      		return 0; 	}                      

Annotation: There is a semi-colon behind the while line.

Break and continue

To exit a loop yous can use the pause statement at any time. This can be very useful if y'all want to stop running a loop because a condition has been met other than the loop end condition. Have a look at the following example:

                          #include<stdio.h>  	int main() 	{      		int i;  		i = 0; 		while ( i < twenty )      		{           		i++;           		if ( i == 10)                		intermission;      		}      		return 0; 	}                      

In the example above, the while loop volition run, as long i is smaller then twenty. In the while loop there is an if statement that states that if i equals ten the while loop must finish (intermission).

With "continue;" it is possible to skip the rest of the commands in the current loop and start from the top once again. (the loop variable must still be incremented). Accept a look at the example below:

                          #include<stdio.h>  	int main() 	{ 		int i;  		i = 0;      		while ( i < 20 )      		{           		i++;           		continue;           		printf("Cipher to see\n");      		}      		render 0; 	}                      

In the case higher up, the printf role is never called because of the "go on;".

That was all for now. Don't forget to make some case programs of your ain, just for practice!

Update: Yous can also have a look at one of the following instance(southward) that besides use for loops and while loops:

• C tutorial: a star pyramid and cord triangle using for loops
• printing a diamond design in C linguistic communication
• How to print floyds triangle in C Linguistic communication

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Source: https://www.codingunit.com/c-tutorial-for-loop-while-loop-break-and-continue