started assignment and added programs

programs/p26/main.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main(void) {
+    int height;
+
+    printf("Input your height in cm: ");
+    scanf("%d", &height);
+
+    printf("Standard weight is %.1fkg.\n", 0.9 * (double)(height - 100));
+
+    return 0;
+}