diff --git a/DeitelC/Chapter4/a.out b/DeitelC/Chapter4/a.out
index ee38609..cdc0996 100644
Binary files a/DeitelC/Chapter4/a.out and b/DeitelC/Chapter4/a.out differ
diff --git a/DeitelC/Chapter4/barChart.c b/DeitelC/Chapter4/barChart.c
new file mode 100644
index 0000000..fa4faac
--- /dev/null
+++ b/DeitelC/Chapter4/barChart.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main(void) {
+    puts("Enter 5 different integers between 1 - 30!");
+    for(int i = 0; i < 5; i++) {
+    printf("Enter %d. integer: ",(i+1));
+    int j;
+    if(!scanf("%d", &j)) {
+            puts("Enter a valid integer!");
+    } else if((j < 1 || j > 30)) {
+        puts("Integer not between 1-30!");
+    }
+
+    for(int t = 0; t < j; t++) {
+        printf("%s","*");
+    }
+    puts("");
+
+    }
+}
diff --git a/DeitelC/Chapter4/calculateSales.c b/DeitelC/Chapter4/calculateSales.c
new file mode 100644
index 0000000..82c9857
--- /dev/null
+++ b/DeitelC/Chapter4/calculateSales.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void){
+    int i, j;
+    
+
+}
diff --git a/DeitelC/Chapter4/creditLimit.c b/DeitelC/Chapter4/creditLimit.c
new file mode 100644
index 0000000..0fe323b
--- /dev/null
+++ b/DeitelC/Chapter4/creditLimit.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+
+int main(void) {
+
+int accNum;
+float limit, debt;
+puts("Enter 3 customer details!");
+    for(int counter = 0; counter < 3; counter++){
+        puts(" ");
+        puts("Enter account number: ");
+        int a = scanf("%d", &accNum);
+        puts("Enter credit limit: ");
+        int b = scanf("%f", &limit);
+        puts("Enter current debt: ");
+        int c = scanf("%f", &debt);
+
+
+
+if (!a || !b || !c) {
+    puts ("Enter valid data!");
+}
+
+printf("Account number: %d, Account old credit limit: %.2f, Account current debt: %.2f.\n", accNum, limit, debt);
+
+if(limit/2 < debt) {
+    puts("WARNING! ACCOUNT DEBT MORE THAN NEW LIMIT!");
+    printf("New credit limit: %.2f, Current debt: %.2f\n", (limit/2), debt);
+} else {
+    printf("New credit limit: %.2f, Current debt: %.2f\n", (limit/2), debt);
+}
+
+}
+}