Iterative Statements

These are statements within our program which are repeatedly executed.
To repeatedly execute statements C provide us three different looping structure.

while loop
for loop
do-while loop

While loop

Statements within this loop are repeatedly executed while condition is true.

Execution of while loop

If condition is true then statements within if block are executed and then program control is transferred to next statements. If condition is true, then statement within while loop are executed and again 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.

while(condition)
{
  statements
  ----------
  ----------
}  
next statements

#Write a program to print all numbers from 1 to 10.

  #include⁢stdio.h>
  main()
  {
    int i=1;
    while(i<=10)
    {
        printf("%d ",i);
        i++;
    }
  }

  1 2 3 4 5 6 7 8 9 10

#Write a program to print all numbers from 10 to 1.

  #include⁢stdio.h>
  main()
  {
    int i=10;
    while (i>=1)
    {
        printf("%d ",i);
        i--;
    }
  }

  10 9 8 7 6 5 4 3 2 1

#Write a program to print all numbers from 10 to 20.

  #include⁢stdio.h>
  main()
  {
    int i=10;
    while(i<=20)
    {
        printf("%d\n",i);
        i++;
    }
  }

#Write a program to print all odd numbers from 1 to 100.

  #include⁢stdio.h>
  main()
  {
    int i=1;
    while(i<=100)
    {
        printf("%d ",i);
        i=i+2;
    }
  }

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99

#Write a program to print all numbers from 1 to 100 which are divisible by 2 or 3
Output: 2 3 4 6 8 9 10 12 14 15 16 18 . . . .100

  #include⁢stdio.h>
  main()
  {
    int i=1;
    while(i<=100)
    {
        if(i%2==0 || i%3==0)
            printf("%d ",i);
        i++;
    }    
  }

2 3 4 6 8 9 10 12 14 15 16 18 20 21 22 24 26 27 28 30 32 33 34 36 38 39 40 42 44 45 46 48 50 51 52 54 56 57 58 60 62 63 64 66 68 69 70 72 74 75 76 78 80 81 82 84 86 87 88 90 92 93 94 96 98 99 100

#Write a program to print Amravati 10 times.

  #include⁢stdio.h>
  main()
  {
    int i=1;
    while(i<=10)
    {
        printf("Amravati\n");
        i++;
    }
  }

  Amravati
  Amravati
  Amravati
  Amravati
  Amravati
  Amravati
  Amravati
  Amravati
  Amravati
  Amravati

#Write a program to read 10 numbers and find sum of all numbers.

  #include⁢stdio.h>
  main()
  {
    int a,i=1,s=0;
    while(i<=10)
    {
        printf("Enter a Number ");
        scanf("%d",&a);
        s=s+a;
        i++;
    }
    printf("Sum is %d",s);
  }

  Enter a number 5
  Enter a number 6
  Enter a number 2
  Enter a number 9
  Enter a number 3
  Enter a number 4
  Enter a number 1
  Enter a number 7
  Enter a number 8
  Enter a number 3
  Sum is 48

#Write a program to read 10 numbers and find sum of all even as well as odd numbers.

  #include⁢stdio.h>
  main()
  {
    int a,i=1,s1=0,s2=0;
    printf("Enter 10 Numbers ");
    while(i<=10)
    {
        scanf("%d",&a);
        if(a%2==0)
            s1=s1+a;
        else
            s2=s2+a;
        i++;
    }
    printf("Sum of Even Numbers is %d",s1);
    printf("\nSum of Odd Numbers is %d",s2);
  }

  Enter a number 5
  Enter a number 6
  Enter a number 2
  Enter a number 9
  Enter a number 3
  Enter a number 4
  Enter a number 1
  Enter a number 7
  Enter a number 8
  Enter a number 3
  Sum of even nos is 20
  Sum of odd nos is 28

CCITcoder

Introduction to C

DataType and Operation

Conditional statements

Iterative statements

Functions

Array

Pointers

Structures

File I/O

Graphics

Additional Features

Introduction to C

DataType and Operation

Conditional statements

Iterative statements

Functions

Array

Pointers

Structures

File I/O

Graphics

Additional Features

Iterative Statements

Iterative Statements

While loop