Add remaining prog exercises of chapter 04

c_primer_plus/chapter04/07.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <float.h>
+
+
+
+int main (void) {
+
+
+  float f_var = 1.0 / 3.0;
+  double d_var = 1.0 / 3.0;
+
+  printf("float: %18.4f double: %18.4g\n", f_var, d_var);
+  printf("float: %18.12f double: %18.12g\n", f_var, d_var);
+  printf("float: %.16f double: %.16g\n", f_var, d_var);
+  printf("FLT_DIG: %16d DBL_DIG: %17d \n", FLT_DIG, DBL_DIG);
+
+  return 0;
+
+}

c_primer_plus/chapter04/08.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+
+#define LITERS_PER_GALLON 3.786
+#define KM_PER_MILE 1.609
+
+
+int main (void) {
+
+  float miles;
+  float gallons;
+
+  printf("Miles traveled: ");
+  scanf("%f", &miles);
+  printf("gasoline gallons: ");
+  scanf("%f", &gallons);
+
+  printf("Miles per gallon: %.1f\n", miles / gallons);
+  printf("Liters per 100km: %.1f\n", (gallons * LITERS_PER_GALLON)/(miles * KM_PER_MILE));
+
+  return 0;
+
+}