Iterative Statements

Do-While Loop

This Loop is used to repeatedly execute statements.
In this loop statements are executed first and then condition is checked
Due to this Statements within this loop are executed at least once regardless of condition whether it is true or false.

Execution of Do-while loop

First statement within do-while loop are executed and condition is checked
The above process is repeated while the condition is true
Program control is transferred to next statements only when condition becomes false.

Syntax:

do{
    Statements
    ----------
}    
while(condition);
next statements...

#Write a program to read numbers while numbers entered is not equals to zero. And find sum of all numbers entered.

  #include⁢stdio.h>
  main()
  {
    int a,s=0;
    printf("Enter numbers");
    do
    {
        scanf("%d",&a);
        s=s+a;
    }while(a!=0);
    printf("sum is %d",s);
  }

  Enter a number 5 2 3 6 0
  Sum is 16

#Write a program to read numbers while numbers entered is not equals to zero. And find sum of all Even numbers entered.

  #include⁢stdio.h>
  main()
  {
    int a,s=0;
    printf("Enter numbers");
    do
    {
        scanf("%d",&a);
        if(a%2==0)
            s=s+a;
    }while(a!=0);
    printf("sum of even is %d",s);
  }

  Enter a number 5 2 7 6 0
  Sum of even is 8

#Write a program to read numbers while numbers entered is not equals to zero. And find sum of all even numbers and odd numbers entered.

  #include⁢stdio.h>
  main()
  {
    int a,s1=0,s2=0;
    printf("Enter numbers");
    do
    {
        scanf("%d",&a);
        if(a%2==0)
            s1=s1+a;
        else
            s2=s2+a;
    }while(a!=0);
    printf("sum of all even no. is %d\n",s1);
    printf("sum of all odd no. is %d",s2);
  }

  Enter a number 2 5 8 3 6 0
  sum of all even no. is 16
  sum of all odd no. is 8

#Write a program to read numbers while numbers entered is not equals to zero. And count all negative numbers as well as positive numbers entered entered.

  #include⁢stdio.h>
  main()
  {
    int a,c1=0,c2=0;
    printf("Enter numbers");
    do
    {
        scanf("%d",&a);
        if(a>0)
            c1=c1+1;
        if(a ⁢ 0)
            c2=c2+1;
    }while( a!=0);
    printf("Total positive no. are %d\n",c1);
    printf("Total negative no. are %d",c2);
  }

  Enter a number 2 -5 8 -3 6 0
  Total positive no. are 3
  Total negative no. are 2

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