Arrays and Structures

Source Code from Notes

Example

Program to input each of the temperatures over the 30 days to calculate the average temperature during the period.


/* Program to input 30 temperature samples and calculate their average */
#include <stdio.h>
#define DURATION 30

main()
{
        int     day;
        float   temperature[DURATION];
        float   average, total;

        /*Enter temperature values */
        for (day =0; day < 30;day++)
        {
                printf("Enter temperature of day %d\n",day);
                scanf("%f",&temperature[day]);
        }

        /* initialise total variable */
        total = 0.0;

        /* sum temperatures for each day */
        for (day=0; day < DURATION; day++)
        {
                total += temperature[day];
        }

        /* calculate average */
        average = total/DURATION;


        /*output result */
        printf("The average temperature is %f\n",average);

}

Example

The following example reads in a sentence which is terminated by a full stop and calculates the number of lower case vowels in the sentence. An array of char elements is defined. The length of this array is limited to 100 elements.


/* Program to count for number of vowels in a sentence */
/* the sentence must be terminated by a full stop (.)  */
#include <stdio.h>
#define max_length 100 /*max number of characters in sentence */

main()
{
        char    sentence[max_length];
        int     i,count,length;

        i = 0;
        count = 0;

        /* enter the sentence */
        printf("Enter a sentence terminated by a full stop \n");
        do {
                scanf("%c",&sentence[i]);
                i++;
        } while(sentence[i-1] != '.' && i < max_length);

        length = i;

        /* count number of lower case vowels */

        for (i=0;i < length;i++)
        {
                if (sentence[i] == 'a' || sentence[i] == 'e' || sentence[i]
                    == 'i' || sentence[i] == 'o' || sentence[i] =='u') {
                        count++;
                }
        }

        /* output number of vowels */
        printf("The number of lower case vowels is %d\n",count);
}

Example

Two dimensional array example where the average temperature each month for the last 20 years is declared and the user is then prompted to enter the values


#include <stdio.h>

#define NO_MONTHS 12
#define NO_YEARS 20

main()
{
        float   temperature[NO_YEARS][NO_MONTHS];
        int     years,month;

        /* input values to array */

        for (years = 0;years < NO_YEARS;years++)
        {
                for (month=0;month < NO_MONTH;month++)
                {
                        printf("Enter temperature ");
                        scanf("%f",&temperature[years][month]);
                }
        }
}

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Arrays and Structures Source Code from Notes

Example

Example

Example

Arrays and Structures

Source Code from Notes