#include
#include
int sum(int *, int, int);
int main() {
int a, b, c, summa = 0, * sm = &summa, flag;
printf("a, b?.. ");
scanf_s("%d%d", &a, &b);
flag = sum(sm, a, b);
if (flag) {
printf("Summa(A, = %d\n", summa);
} else printf("\aError!\n");
printf("c?.. ");
scanf_s("%d", &c);
flag = sum(sm, b, c);
if (flag) {
printf("Summa(B, C) = %d\n", summa);
} else printf("\aError!\n");
_getch();
return 0;
}
int sum(int * s, int x, int y) {
int n, fl = 1;
if (x > y) fl = 0;
if (fl) for (n = x; n <= y; n++) *s += n;
return fl;
}