20.Example of array with pointer

 #include <stdio.h>

int main()

{

    int sum = 0; float percentage;

    int a[5];

    int *ptr=a;

    for (int i = 0; i < 5; i++)

    {

        printf("\nEnter the marks of subject %d:", i + 1);

        scanf("%d",ptr);//or scanf("%d",&a[0]);

        ptr++;

    }

    for (int j = 0; j < 5; j++)

    {

        printf("The marks of subject %d is:%d\n", j + 1, a[j]);

        sum = sum + a[j];

    }

    printf("\nTotal marks=%d", sum);

    percentage = (float)(sum*100)/500;

    printf("\nPercentage=%0.2f%%",percentage);//%% is used to print %

    return 0;

}