diff --git a/DeitelC/IsPrime.c b/DeitelC/IsPrime.c
new file mode 100644
index 0000000..f89f9ff
--- /dev/null
+++ b/DeitelC/IsPrime.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+void isPrime(int number) {
+int a = 1;
+int count = 0;
+
+while (a < number) {
+	if(number%a == 0) {
+	count += 1;
+	a++;
+    } else {
+        a++;
+    }
+}
+
+if(count == 1) {
+	printf("%s\n", "Yes it's a Prime");
+
+    } else {
+	printf("%s\n", "No it isn't a Prime");
+    }
+}
+int main(void) {
+    int number;
+    printf("%s\n", "Enter a integer!");
+    scanf("%d", &number);
+    isPrime(number);
+}
\ No newline at end of file
diff --git a/DeitelC/Salary.c b/DeitelC/Salary.c
new file mode 100644
index 0000000..d6df20f
--- /dev/null
+++ b/DeitelC/Salary.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+
+
+int main(void) {
+    printf("%s\n", "Enter # of hours worked (-1 to End):");
+    int hours;
+    scanf("%d", &hours);
+    if (hours == -1) {
+        return 0;
+    };
+    printf("%s\n","Enter hourly rate of the worker ($00.00):");
+    float hourly;
+    scanf("%f", &hourly);
+
+    if(hours <= 40) {
+        while(hours != -1){
+        printf("%s %.2f\n", "Salary is: ", hourly*hours);
+        printf("%s\n", "Enter # of hours worked (-1 to End):");
+        scanf("%d", &hours);
+    if (hours == -1) {
+        return 0;
+    };
+        printf("%s\n","Enter hourly rate of the worker ($00.00):");
+        scanf("%f", &hourly);
+
+        }
+        return 0;
+    }
+    if (hours > 40) {
+        while(hours != -1) {
+        float OneHalf = ((hours - 40)*hourly)*(1,5);
+        printf("%s %.2f\n", "Salary is :", 400+OneHalf);
+        printf("%s\n", "Enter # of hours worked (-1 to End):");
+        scanf("%d", &hours);
+            if (hours == -1) {
+        return 0;
+    }
+        printf("%s\n","Enter hourly rate of the worker ($00.00):");
+        scanf("%f", &hourly);
+        }
+        return 0;
+        
+
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/DeitelC/SalesCommision.c b/DeitelC/SalesCommision.c
new file mode 100644
index 0000000..a996bfa
--- /dev/null
+++ b/DeitelC/SalesCommision.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main(void) {
+    
+    printf("%s\n", "Enter sales in dollars (-1 to end):");
+    float sale;
+    scanf("%f", &sale);
+
+   while (sale != -1) {
+    printf("%s %.2f\n", "Salary is:", ((sale*9)/100)+200);
+    printf("%s\n", "Enter sales in dollars (-1 to end):");
+    scanf("%f", &sale);
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/DeitelC/a.exe b/DeitelC/a.exe
index 028c1c8..fbc900b 100644
Binary files a/DeitelC/a.exe and b/DeitelC/a.exe differ