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Here are a few examples of the do-while loop.

Printing table of a number using do-while:

#include<stdio.h>  
int main(){    
 int i=1;      
 do{    
    printf("6 * %d = %d \n",i,i*6);    
    i++;    
  }while(i<=10);   
 return 0;  
}

output:

6 * 1 = 6 
6 * 2 = 12 
6 * 3 = 18 
6 * 4 = 24 
6 * 5 = 30 
6 * 6 = 36 
6 * 7 = 42 
6 * 8 = 48 
6 * 9 = 54 
6 * 10 = 60 

• using the do-while loop, the value of ‘i’ is multiplied by 6.
• The loop continues till the value of ‘i’ is less than or equal to 10.
• Finally, the table of the given number is printed.

Calculating factorial of a number using a do-while loop:

#include<stdio.h>

void main()
{
    int n,i=1,f=1;
    
     
    printf("\n Enter The Number:");
    scanf("%d",&n);
     
    //LOOP TO CALCULATE THE FACTORIAL OF A NUMBER
    do
    {
        f=f*i;
        i++;
    }while(i<=n);
     
    printf("\n The Factorial of %d is %d",n,f);
   
}

output:

Enter The Number:5
The Factorial of 5 is 120

• first, the computer reads the number to find the factorial of the number from the user.
• Then, using the do-while loop, the value of ‘i’ is multiplied by the value of ‘f’.
• The loop continues till the value of ‘i’ is less than or equal to ‘n’.
• Finally, the factorial value of the given number is printed.

printing reverse of a number:

#include<stdio.h>

void main()
{
    int num,reverse=0,rem;
    printf("Enter a number: ");
    scanf("%d",&num);
    
    do{
        rem=num%10;
        reverse=reverse*10+rem;
        num/=10;
    }while(num!=0);
    printf("Reverse number %d\n",reverse);
    
}

output:

Enter a number: 12345
Reverse number 54321

• first, the computer reads the number to find the reverse of the number from the user.
• Then, using the do-while loop, the digit of the number is extracted and added in the ‘reverse’.
• The loop continues till the value of ‘num’ is not equal to 0.
• Finally, the reverse value of the given number is printed.

In the above-given do-while loop examples, we could clearly see that it is an exit-controlled loop.

Note: also read about do-while loop in c & while loop examples in c

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