LOOPS | C Programming Tutorial pdf

Loops

There may be a situation when you need to execute a block of code several number of times. In general statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.
Programming languages provide various control structures that allow for more complicated execution paths.
A loop statement allows us to execute a statement or group of statements multiple times and following is the general from of a loop statement in most of the programming languages:

C programming language provides following types of loop to handle looping requirements. Click the following links to check their detail.
 

Loop Control Statements:

Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.
C supports the following control statements. Click the following links to check their detail.
 

The Infinite Loop:

A loop becomes infinite loop if a condition never becomes false. The for loop is traditionally used for this
purpose. Since none of the three expressions that form the for loop are required, you can make an endless
loop by leaving the conditional expression empty.
#include <stdio.h>
int main ()
{
for( ; ; )
{
printf("This loop will run forever.\n");
}
return 0;
}When the conditional expression is absent, it is assumed to be true. You may have an initialization and
increment expression, but C programmers more commonly use the for(;;) construct to signify an infinite
loop.
NOTE: You can terminate an infinite loop by pressing Ctrl + C keys.