initial

1sem/programming basics/2/1.cpp

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+// pb_2_1.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+using namespace std;
+
+int main() {
+    double x1, y1, x2, y2, x3, y3;
+    printf("x1 y1 x2 y2 x3 y3 >>>");
+    scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3);
+    double S = ((x1 - x3)*(y2 - y3) - (x2 - x3)*(y2 - y3)) / 2.f;
+    //       1  | x1-x3    y1-y3 |
+    //  S = --- |                |
+    //       2  | x2-y3    y2-y3 |
+    printf("S=%f", abs(S));
+}