Do While Loop in C
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do-while in C
A do-while loop is similar to a while Loop in C, except that a do-while loop is execute at least one time.
A do while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block, or not, depending on a given condition at the end of the block (in while).
Syntax
do { Statements; ........ Increment or Decrements (++ or --) } while(condition);
Flow Diagram
When use do..while loop
when we need to repeat the statement block at least one time then use do-while loop. In do-while loop post-checking process will be occur, that is after execution of the statement block condition part will be executed.
In below example you can see in this program i=20 and we check condition i is less than 10, that means condition is false but do..while loop execute once and print Hello world ! at one time.
Example of do..while loop
#include<stdio.h> #include<conio.h> void main() { int i=20; do { printf("Hello world !"); i++; } while(i<10); getch(); }
Output
Hello world !
Example of do..while loop
#include<stdio.h> #include<conio.h> void main() { int i; clrscr(); i=1; do { printf("\n%d",i); i++; } while(i<5); getch(); }
Output
1 2 3 4
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