diff --git a/DeitelC/1to10Sum.c b/DeitelC/Chapter3/1to10Sum.c
similarity index 100%
rename from DeitelC/1to10Sum.c
rename to DeitelC/Chapter3/1to10Sum.c
diff --git a/DeitelC/3over10factoriel.c b/DeitelC/Chapter3/3over10factoriel.c
similarity index 100%
rename from DeitelC/3over10factoriel.c
rename to DeitelC/Chapter3/3over10factoriel.c
diff --git a/DeitelC/ArmstrongNumbers.c b/DeitelC/Chapter3/ArmstrongNumbers.c
similarity index 100%
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diff --git a/DeitelC/BinaryToDecimal.c b/DeitelC/Chapter3/BinaryToDecimal.c
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diff --git a/DeitelC/BonusInstructor.c b/DeitelC/Chapter3/BonusInstructor.c
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rename to DeitelC/Chapter3/BonusInstructor.c
diff --git a/DeitelC/Chapter3/CheckConstantEOverX.c b/DeitelC/Chapter3/CheckConstantEOverX.c
new file mode 100644
index 0000000..eb45894
--- /dev/null
+++ b/DeitelC/Chapter3/CheckConstantEOverX.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+double powerFun(double base, int exponent) {
+    double result = 1.0;
+    for (int i = 0; i < exponent; i++) {
+        result *= base;
+    }
+    return result;
+}
+
+int main(void) {
+    int userData;
+    printf("Please Enter x (in E^x): ");
+    scanf("%d", &userData);
+
+    double constant = 2.0; // Initialize constant as a double
+    double counter = 1.0; // Initialize counter to 1.0
+    double data = 1.0; // Initialize data to 1.0
+
+    for (int i = 1; i <= userData; i++) {
+        data *= constant; // Update data by multiplying with constant
+        double term = powerFun(userData, i) / data; // Calculate the term for the current iteration
+        counter += term; // Add the term to the counter
+        printf("counter: %f\n", counter);
+    }
+
+    printf("e^%d = %f\n", userData, counter);
+
+    return 0;
+}
diff --git a/DeitelC/CheckerboardPattern.c b/DeitelC/Chapter3/CheckerboardPattern.c
similarity index 100%
rename from DeitelC/CheckerboardPattern.c
rename to DeitelC/Chapter3/CheckerboardPattern.c
diff --git a/DeitelC/Circle.c b/DeitelC/Chapter3/Circle.c
similarity index 100%
rename from DeitelC/Circle.c
rename to DeitelC/Chapter3/Circle.c
diff --git a/DeitelC/ClassAvarage.c b/DeitelC/Chapter3/ClassAvarage.c
similarity index 100%
rename from DeitelC/ClassAvarage.c
rename to DeitelC/Chapter3/ClassAvarage.c
diff --git a/DeitelC/ConditionalExpression.c b/DeitelC/Chapter3/ConditionalExpression.c
similarity index 100%
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rename to DeitelC/Chapter3/ConditionalExpression.c
diff --git a/DeitelC/Chapter3/ConstantE.c b/DeitelC/Chapter3/ConstantE.c
new file mode 100644
index 0000000..3b3e53c
--- /dev/null
+++ b/DeitelC/Chapter3/ConstantE.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main(void) {
+    float constant = 2;
+    float counter = 2;
+    float data = 1;
+    float check = 1;
+    while(constant <= 40) {;
+            data = constant * data;
+            check = 1/data;
+            counter = check + counter;
+            printf("%s %f\n","counter :", counter);
+
+            constant++;
+        }
+        return 0;
+    }
\ No newline at end of file
diff --git a/DeitelC/Chapter3/ConstantEOverX.c b/DeitelC/Chapter3/ConstantEOverX.c
new file mode 100644
index 0000000..410704d
--- /dev/null
+++ b/DeitelC/Chapter3/ConstantEOverX.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+int powerFun(int userData, int i) {
+    float result = 1.0;
+    while (i > 0) {
+        result *= userData;
+        i--;
+    }
+    return result;
+}
+
+int main(void) {
+    double constant = 2;
+    double counter = 2;
+    double data = 1;
+    float check = 1;
+    int userData;
+    int i = 1;
+    printf("%s\n","Please Enter x (in E^x): ");
+    scanf("%d", &userData);
+    while(i <= userData) {
+            data = constant * data;
+            check = powerFun(userData, i)/data;
+            counter = check + counter;
+            printf("%s %f\n","counter :", counter);
+            printf("%s %d\n","PowerFun:", powerFun(userData, i));
+            i++;
+            constant++;
+        }
+        return 0;
+    }
\ No newline at end of file
diff --git a/DeitelC/Factoriel.c b/DeitelC/Chapter3/Factoriel.c
similarity index 100%
rename from DeitelC/Factoriel.c
rename to DeitelC/Chapter3/Factoriel.c
diff --git a/DeitelC/FloydsTriangle.c b/DeitelC/Chapter3/FloydsTriangle.c
similarity index 100%
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rename to DeitelC/Chapter3/FloydsTriangle.c
diff --git a/DeitelC/HelloPrint.c b/DeitelC/Chapter3/HelloPrint.c
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diff --git a/DeitelC/HollowSquareOfAsteriks.c b/DeitelC/Chapter3/HollowSquareOfAsteriks.c
similarity index 100%
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diff --git a/DeitelC/HowMany9.c b/DeitelC/Chapter3/HowMany9.c
similarity index 100%
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diff --git a/DeitelC/IsPrime.c b/DeitelC/Chapter3/IsPrime.c
similarity index 100%
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diff --git a/DeitelC/LargestNum.c b/DeitelC/Chapter3/LargestNum.c
similarity index 100%
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rename to DeitelC/Chapter3/LargestNum.c
diff --git a/DeitelC/MultiplesOf3WithAnInfiniteLoop.c b/DeitelC/Chapter3/MultiplesOf3WithAnInfiniteLoop.c
similarity index 100%
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rename to DeitelC/Chapter3/MultiplesOf3WithAnInfiniteLoop.c
diff --git a/DeitelC/MultiplesOfNumber.c b/DeitelC/Chapter3/MultiplesOfNumber.c
similarity index 100%
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rename to DeitelC/Chapter3/MultiplesOfNumber.c
diff --git a/DeitelC/PseudocodeBonusInstructor.md b/DeitelC/Chapter3/PseudocodeBonusInstructor.md
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diff --git a/DeitelC/PsudocodeLargestNum.md b/DeitelC/Chapter3/PsudocodeLargestNum.md
similarity index 100%
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diff --git a/DeitelC/RightTriangle.c b/DeitelC/Chapter3/RightTriangle.c
similarity index 100%
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diff --git a/DeitelC/Salary.c b/DeitelC/Chapter3/Salary.c
similarity index 100%
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diff --git a/DeitelC/SalesCommision.c b/DeitelC/Chapter3/SalesCommision.c
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diff --git a/DeitelC/SalesTax.c b/DeitelC/Chapter3/SalesTax.c
similarity index 100%
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diff --git a/DeitelC/SideOfATriangle.c b/DeitelC/Chapter3/SideOfATriangle.c
similarity index 100%
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diff --git a/DeitelC/SquareOfAsteriks.c b/DeitelC/Chapter3/SquareOfAsteriks.c
similarity index 100%
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rename to DeitelC/Chapter3/SquareOfAsteriks.c
diff --git a/DeitelC/TabularOutput.c b/DeitelC/Chapter3/TabularOutput.c
similarity index 100%
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rename to DeitelC/Chapter3/TabularOutput.c
diff --git a/DeitelC/TabularOutputPower.c b/DeitelC/Chapter3/TabularOutputPower.c
similarity index 100%
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rename to DeitelC/Chapter3/TabularOutputPower.c
diff --git a/DeitelC/TwoLargestNumber.c b/DeitelC/Chapter3/TwoLargestNumber.c
similarity index 100%
rename from DeitelC/TwoLargestNumber.c
rename to DeitelC/Chapter3/TwoLargestNumber.c
diff --git a/DeitelC/XPowerY.c b/DeitelC/Chapter3/XPowerY.c
similarity index 100%
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diff --git a/DeitelC/a.exe b/DeitelC/Chapter3/a.exe
similarity index 74%
rename from DeitelC/a.exe
rename to DeitelC/Chapter3/a.exe
index 399f74d..e4b3924 100644
Binary files a/DeitelC/a.exe and b/DeitelC/Chapter3/a.exe differ
diff --git a/DeitelC/test1.c b/DeitelC/Chapter3/test1.c
similarity index 100%
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rename to DeitelC/Chapter3/test1.c
diff --git a/DeitelC/test2.c b/DeitelC/Chapter3/test2.c
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diff --git a/DeitelC/Chapter4/a.exe b/DeitelC/Chapter4/a.exe
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diff --git a/DeitelC/Chapter4/sum99.c b/DeitelC/Chapter4/sum99.c
new file mode 100644
index 0000000..67e198a
--- /dev/null
+++ b/DeitelC/Chapter4/sum99.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <math.h>
+
+int main(void) {
+    int sum = 0;
+    int count = 1;
+
+    for(;count<=99;count+=2) {
+        sum += count;
+    }
+        printf("%d\n", sum);
+        printf("%.2f\n", pow(2.5,3));
+    return 0;
+}
\ No newline at end of file