diff --git a/c_primer_plus/chapter03/01.c b/c_primer_plus/chapter03/01.c
new file mode 100644
index 0000000..afc1416
--- /dev/null
+++ b/c_primer_plus/chapter03/01.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <limits.h>
+#include <float.h>
+
+
+
+int main (void) {
+
+  int   a = INT_MAX;
+  float b = FLT_MAX;
+
+  // overflow
+  printf("Integer overflow: %d\n", a+1);
+  printf("Float overflow:   %f\n", b + 1.0);
+
+  a = INT_MIN;
+  b = -FLT_MAX;
+
+  // underflow
+  printf("Integer underflow: %d\n", a-1);
+  printf("Float underflow:   %f\n", b-1.0);
+
+  return 0;
+
+}
\ No newline at end of file
diff --git a/c_primer_plus/chapter03/02.c b/c_primer_plus/chapter03/02.c
new file mode 100644
index 0000000..929976a
--- /dev/null
+++ b/c_primer_plus/chapter03/02.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+
+
+int main (void) {
+
+  unsigned int a;
+
+  printf("Give an ASCII code value: ");
+  scanf("%u", &a);
+
+  if (a > 127) {
+    printf("Outside of ASCII range\n");
+    return 1;
+  } else {
+    printf("The character is: %c\n", a);
+  }
+
+  return 0;
+
+}
\ No newline at end of file
diff --git a/c_primer_plus/chapter03/03.c b/c_primer_plus/chapter03/03.c
new file mode 100644
index 0000000..755f05f
--- /dev/null
+++ b/c_primer_plus/chapter03/03.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+
+
+int main (void) {
+
+  printf("Startled by the sudden sound, Sally shouted,\n");
+  printf("\"By the Great Pumpkin, what was that!\"\n");
+
+  return 0;
+
+}
\ No newline at end of file
diff --git a/c_primer_plus/chapter03/04.c b/c_primer_plus/chapter03/04.c
new file mode 100644
index 0000000..403089a
--- /dev/null
+++ b/c_primer_plus/chapter03/04.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+
+
+int main (void) {
+
+  float a;
+
+  printf("Enter a floating-point value: ");
+  scanf("%f", &a);
+  printf("fixed-point notation: %f\n", a);
+  printf("exponential notation: %e\n", a);
+  printf("p notation: %a\n", a);
+
+  return 0;
+
+}
diff --git a/c_primer_plus/chapter03/05.c b/c_primer_plus/chapter03/05.c
new file mode 100644
index 0000000..77b1d47
--- /dev/null
+++ b/c_primer_plus/chapter03/05.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <limits.h>
+
+
+
+int main (void) {
+
+  unsigned age;
+
+  printf("Enter your age: ");
+  scanf("%u", &age);
+
+  if ((unsigned int)(UINT_MAX / 3.156e7) < age) {
+    printf("Integer overflow\n");
+    return 1;
+  } else {
+    printf("You are %u seconds old\n", (unsigned int)(age * 3.156e7));
+  }
+
+  return 0;
+
+}
diff --git a/c_primer_plus/chapter03/06.c b/c_primer_plus/chapter03/06.c
new file mode 100644
index 0000000..80ebb0b
--- /dev/null
+++ b/c_primer_plus/chapter03/06.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+
+
+int main (void) {
+
+  float quarts;
+
+  printf("Enter a amount of water, in quarts: ");
+  scanf("%f", &quarts);
+  printf("Number of molecules: %e\n", quarts * 950.0 / 3.0e-23);
+
+  return 0;
+
+}