The C++ do-while loop is used to iterate a part of the program multiple times.
If the number of iteration is not fixed and you must have to execute the loop at least once, then you can use do-while loop.
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Flow Chart: -
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| C++ Do-While loop |
C++ do-while Loop
Unlike for and while loops, which test the loop condition at the highest of the loop, the do...while loop checks its condition at rock bottom of the loop.
A do...while loop is analogous to a while loop, except that a do...while loop is bound to execute a minimum of just one occasion .
Unlike for and while loops, which test the loop condition at the highest of the loop, the do...while loop checks its condition at rock bottom of the loop.
A do...while loop is analogous to a while loop, except that a do...while loop is bound to execute a minimum of just one occasion .
Syntax: -
Example: -
When the above code is executed, it generates the following Output −
do
{
//Code will be executed
}while (condition);
{
//Code will be executed
}while (condition);
Example: -
#include
<iostream>
using namespace std;
int main() {
using namespace std;
int main() {
int i=1;
do
{
cout << i <<"\n";
i++;
}while (i <= 5);
}
do
{
cout << i <<"\n";
i++;
}while (i <= 5);
When the above code is executed, it generates the following Output −
Output:
1
2
3
4
5
1
2
3
4
5
C++ Nested do-While Loop
if you employ do-while loop inside another do-while loop, it's referred to as nested do-while loop. The nested do-while loop is executed fully for every outer do-while loop.
Syntax: -
Example: -
When the above code is executed, it generates the following Output −
if you employ do-while loop inside another do-while loop, it's referred to as nested do-while loop. The nested do-while loop is executed fully for every outer do-while loop.
Syntax: -
do
{
do {
//Code going to be executed
}while(condition);
}while(condition);
do {
//Code going to be executed
}while(condition);
}while(condition);
Example: -
#include
<iostream>
using namespace std;
int main() {
using namespace std;
int main() {
int i=1;
do
{
}
do
{
int j=1;
do
{
cout << i <<" "<< j <<"\n";
j++;
}while(j <= 2);
i++;
}while(i <= 2);do
{
cout << i <<" "<< j <<"\n";
j++;
}while(j <= 2);
i++;
When the above code is executed, it generates the following Output −
Output:
1 1
1 2
2 1
2 2
1 1
1 2
2 1
2 2
C++ Infinite do-While Loop
If we use true keyword within the condition a part of do-while loop then it'll become infinite do-while loop.
Syntax: -
Example: -
When the above code is compiled and executed, it produces the following Output −
If we use true keyword within the condition a part of do-while loop then it'll become infinite do-while loop.
Syntax: -
do
{
//Code will be executed
}while(true);
{
//Code will be executed
}while(true);
Example: -
#include
<iostream>
using namespace std;
int main() {
using namespace std;
int main() {
do
{
cout << "Infinite do-While Loop";
}while(true);
}
{
cout << "Infinite do-While Loop";
}while(true);
When the above code is compiled and executed, it produces the following Output −
Output:
Infinite do-While Loop
Infinite do-While Loop
Infinite do-While Loop
Infinite do-While Loop
Infinite do-While Loop
.
.
.
Infinite do-While Loop
Infinite do-While Loop
Infinite do-While Loop
Infinite do-While Loop
Infinite do-While Loop
.
.
.
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