chapter5

DeitelC/Chapter5/sidesOfTriangle.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <math.h>
+
+double sidesOfTriangle (double s1, double s2, double s3);
+
+int main (void) {
+    double s1, s2, s3;
+    printf("%s\n","Enter sides of triangle");
+    scanf("%lf%lf%lf", &s1, &s2, &s3);
+    double area = sidesOfTriangle(s1, s2, s3);
+    if(area >= 0) {
+        printf("%3s%lf\n", "Area: ", area);
+    }
+    return 0;
+}
+
+double sidesOfTriangle (double s1, double s2, double s3) {
+    double perimeter = s1 + s2 + s3;
+    double u = perimeter / 2;
+    if ((s1 < s2 + s3) && (s2 < s1 + s3) && (s3 < s1 + s2)) {
+        return sqrt(u * (u - s1) * (u - s2) * (u - s3));
+    }
+    return -1;
+}