Sum of Arithmetic Progression

/* Write a program to calculate the sum in Arithmetic Progression */ #include<stdio.h> #include<math.h> int main() { int a, d, n, i, tn; int sum = 0; printf("Enter the first number of the AP: "); scanf("%d", &a); printf("Enter the total numbers in the AP: "); scanf("%d", &n); printf("Enter the common difference of AP: "); scanf("%d", &d); sum = (n * (2*a + (n-1) * d)) / 2; tn = a + (n-1) * d; printf("Sum of the numbers in the AP: "); for(i=a; i<=tn; i=i+d ) { if (i != tn) printf("%d + ", i); else printf("%d = %d ", i, sum); } getch(); return 0; }

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