Multiple conditions for if statement in C / C++ Do while loop in C / C++ with examples
In last tutorial, we discussed for loop in C / C++ with examples and while loop in C / C++ with examples. In this tutorial. We will learn about the C / C++ do while loop and its working with the help of some examples.
Top 15 do while loop in C / C++ with examples
Here, we will give 10 examples of do while loop in C/C++. These examples are written in two different languages, C and C++.
Example 1: Printing numbers from 1 to 100 with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int i = 1;
cout<<"Numbers from 1 to 100:\n ";
do{
cout << i << " ";
i++;
}
while (i <= 100);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
int i = 1;
printf("Numbers from 1 to 100: \n");
do{
printf("%d ", i);
i++;
}
while (i <= 100);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 2: Displaying a text 10 times with for do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int i = 1;
cout<<"Displaying a text 10 times with do while loop in C / C++. \n\n";
do{
cout <<"Hello, I'm learnc.net\n";
i++;
}
while (i <= 10);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
int i = 1;
printf("Displaying a text 10 times with do while loop in C / C++. \n\n");
do{
printf("Hello, I'm learnc.net\n");
i++;
}
while (i <= 10);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 3: Find the sum of first n Natural Numbers with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int num, sum, i = 1;
sum = 0;
cout << "Enter a positive integer: ";
cin >> num;
do{
sum += i;
i++;
}
while(i <= num);
cout << "Sum = " << sum << endl;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
int num, sum, i = 1, j = 1;
sum = 0;
printf("Enter a positive integer: ");
scanf("%d", &num);
printf("Numbers from 1 to %d: ",num);
do{
printf("%d ", j);
j++;
}
while (j <= num);
do{
sum += i;
i++;
}
while (i <= num);
printf("\nSum = %d\n", sum);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 4: Display elements of array using do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int arr[]={19, 2, 17, 1, 2000, 2003};
int i = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<6);
cout<<"\n\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
int arr[]={19, 2, 17, 1, 2000, 2003};
int i = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<6);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 5: Displaying even numbers from 1 to n with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int n, i = 1;
cout<<"Enter number n: ";
cin>>n;
cout<<"Even numbers from 1 to "<< n<<" is: \n";
do{
if(i % 2 == 0)
cout<<i<<" ";
i++;
}
while(i <= n);
cout<<"\n\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int n, i = 1;
printf("Enter number n: ");
scanf("%d", &n);
printf("Even numbers from 1 to %d is: ", n);
do{
if(i % 2 == 0)
printf("%d ", i);
i++;
}
while(i <= n);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 6: Displaying odd numbers from 1 to n with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int n, i = 1;
cout<<"Enter number n: ";
cin>>n;
cout<<"Odd numbers from 1 to "<< n<<" is: \n";
do{
if(i % 2 == 1)
cout<<i<<" ";
i++;
}
while(i <= n);
cout<<"\n\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int n, i = 1;
printf("Enter number n: ");
scanf("%d", &n);
printf("Odd numbers from 1 to %d is: ", n);
do{
if(i % 2 == 1)
printf("%d ", i);
i++;
}
while(i <= n);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 7: Displaying primes from 1 to n with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
bool isPrimes(int n)
{
if (n < 2){
return false;
}
if (n == 2){
return true;
}
if (n % 2 == 0){
return false;
}
for (int i = 3; i < (n - 1); i += 2){
if (n % i == 0){
return false;
}
}
return true;
}
int main() {
int n, i = 1;
cout<<"Enter number n: ";
cin>>n;
cout<<"Primes from 1 to "<< n<<" is: \n";
do{
if(isPrimes(i))
cout<<i<<" ";
i++;
}
while(i <= n);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
bool isPrimes(int n)
{
if (n < 2){
return false;
}
if (n == 2){
return true;
}
if (n % 2 == 0){
return false;
}
for (int i = 3; i < (n - 1); i += 2){
if (n % i == 0){
return false;
}
}
return true;
}
int main(void) {
int n, i = 1;
printf("Enter number n: ");
scanf("%d", &n);
printf("Primes from 1 to %d is: ", n);
do{
if(isPrimes(i))
printf("%d ", i);
i++;
}
while(i <= n);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 8: Displaying even numbers in array with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
int i = 0, j = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<9);
cout<<"\nEven numbers in array: ";
do{
if(arr[j] % 2 == 0)
cout<<arr[j]<<" ";
j++;
}
while(j<9);
cout<<"\n\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
int i = 0, j = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<9);
printf("\nEven numbers in array: ");
do{
if(arr[j] % 2 == 0)
printf("%d ",arr[j]);
j++;
}
while(j<9);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 9: Displaying odd numbers in array with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
int i = 0, j = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<9);
cout<<"\nOdd numbers in array: ";
do{
if(arr[j] % 2 == 1)
cout<<arr[j]<<" ";
j++;
}
while(j<9);
cout<<"\n\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
int i = 0, j = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<9);
printf("\nOdd numbers in array: ");
do{
if(arr[j] % 2 == 1)
printf("%d ",arr[j]);
j++;
}
while(j<9);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 10: Displaying primes numbers in array with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
bool isPrimes(int n)
{
if (n < 2){
return false;
}
if (n == 2){
return true;
}
if (n % 2 == 0){
return false;
}
for (int i = 3; i < (n - 1); i += 2){
if (n % i == 0){
return false;
}
}
return true;
}
int main() {
int arr[]={1, 5, 9, 7, 11};
int i = 0, j = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<5);
cout<<"\nPrimes in array: ";
do{
if(isPrimes(arr[j]))
cout<<arr[j]<<" ";
j++;
}
while(j<5);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
bool isPrimes(int n)
{
if (n < 2){
return false;
}
if (n == 2){
return true;
}
if (n % 2 == 0){
return false;
}
for (int i = 3; i < (n - 1); i += 2){
if (n % i == 0){
return false;
}
}
return true;
}
int main(void) {
int arr[]={1, 5, 9, 7, 11};
int i = 0, j = 0;
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<5);
printf("\nPrimes in array: ");
do{
if(isPrimes(arr[j]))
printf("%d ",arr[j]);
j++;
}
while(j<5);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 11: Find the sum of elements in array with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int sum = 0, i = 0, j = 0;
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<9);
do{
sum += arr[j];
j++;
}
while(j<9);
cout<<"\nSum of elements in array: "<<sum;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int sum = 0, i = 0, j = 0;
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<9);
do{
sum += arr[j];
j++;
}
while(j<9);
printf("\nSum of elements in array: %d",sum);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 12: Find the sum of even elements in array with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int sum = 0, i = 0, j = 0;;
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<9);
do{
if(arr[j] % 2 == 0) sum += arr[j];
j++;
}
while(j<9);
cout<<"\nSum of even elements in array: "<<sum;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int sum = 0, i = 0, j = 0;
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<9);
do{
if(arr[j] % 2 == 0) sum += arr[j];
j++;
}
while(j<9);
printf("\nSum of even elements in array: %d",sum);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 13: Find the sum of odd elements in array with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int sum = 0, i = 0, j = 0;;
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
cout<<"Elements of array: ";
do{
cout<<arr[i]<<" ";
i++;
}
while(i<9);
do{
if(arr[j] % 2 == 1) sum += arr[j];
j++;
}
while(j<9);
cout<<"\nSum of odd elements in array: "<<sum;
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int sum = 0, i = 0, j = 0;
int arr[]={1, 5, 9, 7, 11, 2, 10, 6, 7};
/* We have set the value of variable i
* to 0 as the array index starts with 0
* which means the first element of array
* starts with zero index.
*/
printf("Elements of array: ");
do{
printf("%d ",arr[i]);
i++;
}
while(i<9);
do{
if(arr[j] % 2 == 1) sum += arr[j];
j++;
}
while(j<9);
printf("\nSum of odd elements in array: %d",sum);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 14: Dislaying the multiplication table with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int n, i = 1;
cout<<"Enter number n: ";
cin>>n;
do{
cout<<n<<" x " <<i<<" = "<<n*i<<"\n";
i++;
}
while(i<= 9);
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
#include <stdbool.h>
int main(void) {
int n, i = 0;
printf("Enter number n: ");
scanf("%d", &n);
do{
printf("%d x %d = %d\n",n,i,n*i);
i++;
}
while(i<= 9);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
Example 15: Display a menu with do while loop in C / C++
C++ programming:
#include <iostream>
using namespace std;
int main() {
int selection;
do
{
cout << "\n------------Menu------------- \n";
cout << "1) Withdraw money\n";
cout << "2) Transfers\n";
cout << "3) Recharge\n";
cout << "4) Check account\n";
cout << "Your choice is: ";
cin >> selection;
if(selection < 1 || selection > 4)
cout<<"\nYou can only choose from 1 to 4, please choose again!\n";
} while (selection < 1 || selection > 4);
cout << "You have selected option: #" << selection << "\n";
cout<<"\n-------------------------------\n";
cout<<"This program is posted at learnnc.com";
return 0;
}C programming:
#include <stdio.h>
int main(void) {
int selection;
do
{
printf("\n------------Menu------------- \n");
printf("1) Withdraw money\n");
printf("2) Transfers\n");
printf("3) Recharge\n");
printf("4) Check account\n");
printf("Your choice is: ");
scanf("%d", &selection);
if(selection < 1 || selection > 4)
printf("\nYou can only choose from 1 to 4, please choose again!\n");
} while (selection < 1 || selection > 4);
printf("You have selected option: #%d\n",selection);
printf("\n-------------------------------\n");
printf("This program is posted at learnnc.com");
return 0;
}Output:
