/*
 * C Program to Find the Sum of A.P Series
 */
#include <stdio.h>
#include <math.h>

int main()
{
    int a, d, n, i, tn;
    int sum = 0;
    printf("Enter the first term value of the A.P. series: ");
    scanf("%d", &a);
    printf("Enter the total numbers in the A.P. series: ");
    scanf("%d", &n);
    printf("Enter the common difference of A.P. series: ");
    scanf("%d", &d);
    sum = (n * (2 * a + (n - 1)* d ))/ 2;
    tn = a + (n - 1) * d;
    printf("Sum of the A.P series is: ");
    for (i = a; i <= tn; i = i + d )
        {
            if (i != tn)
                printf("%d + ", i);
            else
                printf("%d = %d ", i, sum);
        }
    return 0;
}