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diff --git a/3808/CH4/EX4.5/Ex4_5.sce b/3808/CH4/EX4.5/Ex4_5.sce
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+//Chapter 04:Number Theory and Cryptography
+
+clc;
+clear all;
+
+dec=[]
+d=0
+i=1
+disp('Please enter input in inverted commas')
+hex=input("Enter the hexadecimal number:")
+l=length(hex)
+hex=strsplit(hex)
+cn=0
+for i=l:-1:1
+    select hex(i)
+    case 'A' then
+        d=10
+    case 'B' then
+        d=11
+    case 'C' then
+        d=12
+    case 'D' then
+        d=13
+    case 'E' then
+        d=14
+    case 'F' then
+        d=15
+        case 'a' then
+        d=10
+    case 'b' then
+        d=11
+    case 'c' then
+        d=12
+    case 'd' then
+        d=13
+    case 'e' then
+        d=14
+    case 'f' then
+        d=15
+    else
+        d=eval(hex(i))
+    end
+    dec=dec+ (d) *(16**cn)
+    cn=cn+1 
+end
+disp(dec)