The ones who are crazy enough to think they can change the world are the ones who do.- Steve Jobs
C for loop
what is for loop?
Conceptually, for loop is a bit more complex than while loop and do while loop, though syntax is neat and compact way to write certain types of loops. Typically, a programmer need to use a for loop when you exactly know how many times you want a block of statement to be executed repeatedly.
Syntax for loop
Let us see how neat a syntax of for loop is
for (initializeCounter; testCondition; ++ or -- )
{
.
.
}
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Program for loop
The following example program will clearly explain the concept of for loop
#include <stdio.h>
int main()
{
int a;
for(a = 1;a <= 5;a++)
{
printf("%d ",a);
}
return 0;
}
- 1 2 3 4 5
Note:
The variable a is initialized to 1 for the first time when the program execution starts in. The condition a <= 5 is a test condition, which is tested for every iteration. The statements under a loop will be executed repeatedly until the test condition is true.
Infinite for loop
When the for statement contains no test condition between the ;(semicolon) then the loop is said to be an infinite for loop.
Program Infinite for loop
The following C program will clearly demonstrate infinite for loop
#include <stdio.h>
int main()
{
int a = 1;
for(;;)
{
printf("%d ", a++);
}
return 0;
}
- 1 2 3 4 5 ...........
Note:
for(;;) statement allows execution of a loop continued for infinite times.
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