Iteration

Source Code from Notes

Example 1

This example reverses the digits of a number, and prints out the number in the reverse order. Each digit is displayed as it is extracted by the program. The final call to \fC\s8printf\fR\s0 returns the cursor to the next line as the newline character has not been included within the loop. 


#include <stdio.h>

main()
{
        int     number, right_digit;

        printf("Enter your number\n");
        scanf("%d",&number);

        while (number !=0)
        {
                right_digit = number % 10;
                printf("%d",right_digit);
                number /= 10;
        }

        /*return cursor to next line*/
        printf("\n");
}

Example 2

This example checks that the input value is in the desired range 


#include <stdio.h>
#define max 100
#define min 1

main()
{
        int     number;

        number = 0;

        while ( number < min || number > max)
        {
                printf("Enter a number in the range 1 to 100\n");
                scanf("%d",&number);
        }
        printf("the number is in range\n");
}

Example 3 


#include <stdio.h>

main()
{
        char    letter;

        printf("Press Y to continue\n");
        do
        {
                letter = getchar();
        } while (letter != 'y' && letter != 'Y');

        printf("program execution will continue\n");
}

Example 4

The following program creates a conversion table for converting inches to centimetre. The values in the table are calculated for inches in the range 1 to 10 in half inch increments. 

#include <stdio.h>

main()
{
        float   inches,centimetres;

        /* print table header*/
        printf("inches\et centimetres\n");

        /*calculate and print table entries*/
        for (inches = 1; inches <=10 ; inches += 0.5)
        {
                centimetres = 2.54 * inches;
                printf("%6.2f %7.2f\n",inches,centimetres);
        }
}

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