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diff --git a/1964/CH15/EX15.1/ex15_1.sce b/1964/CH15/EX15.1/ex15_1.sce
new file mode 100755
index 000000000..7b97789f4
--- /dev/null
+++ b/1964/CH15/EX15.1/ex15_1.sce
@@ -0,0 +1,11 @@
+//Chapter-15, Example 15.1, Page 492

+//=============================================================================

+clc

+clear

+//INPUT DATA

+x=12;//in decimal form

+//CALCULATIONS

+y=dec2oct(x);//converting to octal form

+mprintf("Thus octal number is");

+disp(y);

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.10/ex15_10.sce b/1964/CH15/EX15.10/ex15_10.sce
new file mode 100755
index 000000000..fad908300
--- /dev/null
+++ b/1964/CH15/EX15.10/ex15_10.sce
@@ -0,0 +1,21 @@
+//Chapter-15, Example 15.10, Page 497

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+//using 1's complement method

+x1=base2dec(['1000'],2)//converting binary to decimal

+x=bin2dec('1010')

+x2=dec2bin(bitcmp(x,4))//1's complement of a number

+disp(x2)

+x3=base2dec([x2],2)

+x4=x1+x3+1;

+x5=dec2base(x4,2)//converting decimal to hexadecimal

+disp(x5)

+//using normal method

+a=base2dec(['1000','1010'],2);//converting binary to decimal

+b=a(2)-a(1);//subtraction

+c=dec2base(b,2)//converting decimal to binary

+disp(c)

+//since we cannot use dec2base for negative integers,we cannot do (a(1)-a(2)) but we can do (a(2)-a(1)),with '-' sign added before the result.hence 'c' here is actually -'c'

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.11/ex15_11.sce b/1964/CH15/EX15.11/ex15_11.sce
new file mode 100755
index 000000000..b719ac2a9
--- /dev/null
+++ b/1964/CH15/EX15.11/ex15_11.sce
@@ -0,0 +1,17 @@
+//Chapter-15, Example 15.11, Page 500

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+x1=base2dec(['1001'],2)//converting binary to decimal

+x2=base2dec(['0100'],2)//converting binary to decimal

+x3=x1+x2;

+if(x3>9)

+    x3=x3+6;

+    z1=dec2base(x3,2)//converting decimal to binary

+else

+    z1=dec2base(x3,2)//converting decimal to binary

+end

+disp(z1)

+//note:last 4 bits represent 3 and 5th bit prefixed with 3 bits will look as 1.hence the combined result will be 13

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.12/ex15_12.sce b/1964/CH15/EX15.12/ex15_12.sce
new file mode 100755
index 000000000..e980e0338
--- /dev/null
+++ b/1964/CH15/EX15.12/ex15_12.sce
@@ -0,0 +1,20 @@
+//Chapter-15, Example 15.12, Page 502

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+disp('given=> Y=(A+AB)')

+//given in the question//

+disp('Y=A(1+B)')//by distributive law

+disp('A.1')//by law 2

+disp('A')//by law 4

+disp('given=> Y=(A+A''B)')

+disp('(A+A'').(A+B)')//by distributive law

+disp('1.(A+B)')//by law 6

+disp('A+B')//by law 4

+disp('given=>(AB+A''C+BC)')

+disp('AB+A''C+BC(A+A'')')

+disp('AB+A''C+ABC+A''BC')

+disp('AB(1+C)+A''C(1+B)')//by consensus theorem

+disp('AB+A''C')

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.13/ex15_13.sce b/1964/CH15/EX15.13/ex15_13.sce
new file mode 100755
index 000000000..d7a2d70d4
--- /dev/null
+++ b/1964/CH15/EX15.13/ex15_13.sce
@@ -0,0 +1,23 @@
+//Chapter-15, Example 15.13, Page 503

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+//for (a)

+disp('given=> Y=(A+AB+AB''C)')

+disp('Y=A+AB''C')//by (A+AB=A)------>step 1

+disp('A(A+B''C)')//by distributive law--------->step 2

+disp('A(1.(1+B''C))')//by talking A as common--------->step 3

+disp('A.1=A')//by 1+B''C=1--------->step 4

+//for (b)

+disp('given=> Y=(A''+B)C+ABC')

+disp('A''C+BC+ABC')//by distributive law-------->step 1

+disp('A''C+BC(1+A)')//by taking BC as common--------->step 2

+disp('A''C+BC')//by rule 2 --------->step 3

+disp('C(A''+B)')//taking C as common term-------->step 4

+//for (c)

+disp('given=> Y=(AB''BCD+AB''CDE+AC'')')

+disp('AB''CDE+AC''')//applying rules 8 and 7 to first and second terms,respectively -------->step 1

+disp('A(B''CDE+C'')')//taking A as common term--------->step 2

+disp('A(B''DE+C'')')//by applying B''CDE+C'=B'DE+C'--------->step 3

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.17/ex15_17.sce b/1964/CH15/EX15.17/ex15_17.sce
new file mode 100755
index 000000000..43e13e958
--- /dev/null
+++ b/1964/CH15/EX15.17/ex15_17.sce
@@ -0,0 +1,12 @@
+//Chapter-15, Example 15.17, Page 513

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+disp('((((A+C''))''(BD''))''.((A+C'').(BD''))'')''')//------>step 1

+disp('((A+C'')+((BD'')'').((A+C)''+(BD'')''))''')//------>step 2

+disp('((A+C'')+(BD'')'').((A+C'')''+(BD'')'')''')//------>step 3

+disp('((BD'')''+((A+C'')((A+C''))'')''')//------>step 4

+disp('(BD'')'')''')//------>step 5

+disp('BD''')//------>step 6

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.19/ex15_19.sce b/1964/CH15/EX15.19/ex15_19.sce
new file mode 100755
index 000000000..b08694ed0
--- /dev/null
+++ b/1964/CH15/EX15.19/ex15_19.sce
@@ -0,0 +1,10 @@
+//Chapter-15, Example 15.19, Page 519

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+//The adjacent cells that can be combined together are the cells 000 and 100 and the cell 011 and 111

+//By combining the adjacent cells,we get

+disp('((A''+A)B''C'')+(A''+A)BC)')//------>step 1

+disp('(B''C'')+(BC)')//------>step 2

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.2/ex15_2.sce b/1964/CH15/EX15.2/ex15_2.sce
new file mode 100755
index 000000000..8a7c6d81f
--- /dev/null
+++ b/1964/CH15/EX15.2/ex15_2.sce
@@ -0,0 +1,12 @@
+//Chapter-15, Example 15.2, Page 492

+//=============================================================================

+clc

+clear

+//INPUT DATA

+x1=444;//in octal form

+x2=237;//in octal form

+x3=120;//in octal form

+//CALCULATIONS

+x1=base2dec(['444','237','120'],8)//converting octal to decimal

+disp(x1);

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.20/ex15_20.sce b/1964/CH15/EX15.20/ex15_20.sce
new file mode 100755
index 000000000..ada4d2872
--- /dev/null
+++ b/1964/CH15/EX15.20/ex15_20.sce
@@ -0,0 +1,7 @@
+//Chapter-15, Example 15.20, Page 519

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+disp('(B''C''D'')+(BC''D)')

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.3/ex15_3.sce b/1964/CH15/EX15.3/ex15_3.sce
new file mode 100755
index 000000000..727e2f530
--- /dev/null
+++ b/1964/CH15/EX15.3/ex15_3.sce
@@ -0,0 +1,13 @@
+//Chapter-15, Example 15.3, Page 493

+//=============================================================================

+clc

+clear

+//INPUT DATA

+x1=112;//in decimal form

+x2=253;//in decimal form

+//CALCULATIONS

+y1=dec2base(x1,16)//converting decimal to hexadecimal

+y2=dec2base(x2,16)//converting decimal to hexadecimal

+disp(y1);

+disp(y2);

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.4/ex15_4.sce b/1964/CH15/EX15.4/ex15_4.sce
new file mode 100755
index 000000000..00fcd8e1d
--- /dev/null
+++ b/1964/CH15/EX15.4/ex15_4.sce
@@ -0,0 +1,8 @@
+//Chapter-15, Example 15.4, Page 494

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+x1=base2dec(['4AB','23F'],16)//converting hexadecimal to decimal

+disp(x1);

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.5/ex15_5.sce b/1964/CH15/EX15.5/ex15_5.sce
new file mode 100755
index 000000000..0d16eaec2
--- /dev/null
+++ b/1964/CH15/EX15.5/ex15_5.sce
@@ -0,0 +1,18 @@
+//Chapter-15, Example 15.5, Page 496

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+x1=base2dec(['1101','1100'],2)//converting binary to decimal

+x2=base2dec(['1000','101'],2)//converting binary to decimal

+x3=base2dec(['1111','1001'],2)//converting binary to decimal

+y1=(x1(1))*(x1(2));//multiplying

+y2=(x2(1))*(x2(2));//multiplying

+y3=(x3(1))*(x3(2));//multiplying

+z1=dec2base(y1,2)//converting decimal to hexadecimal

+z2=dec2base(y2,2)//converting decimal to hexadecimal

+z3=dec2base(y3,2)//converting decimal to hexadecimal

+disp(z1)

+disp(z2)

+disp(z3)

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.6/ex15_6.sce b/1964/CH15/EX15.6/ex15_6.sce
new file mode 100755
index 000000000..f35878ce1
--- /dev/null
+++ b/1964/CH15/EX15.6/ex15_6.sce
@@ -0,0 +1,22 @@
+//Chapter-15, Example 15.6, Page 497

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+x1=base2dec(['110','10'],2)//converting binary to decimal

+x2=base2dec(['1111','110'],2)//converting binary to decimal

+y1=(x1(1))/(x1(2));//dividing

+y2=(x2(1))/(x2(2));//dividing

+z1=dec2base(y1,2);//converting decimal to binary

+[f,e]=frexp(y2);//separting exponent and mantissa

+disp(f)//mantissa

+disp(e)//exponent

+f=f*2;

+g=floor(f);//rounding to nearest integer

+disp(g);

+z2=dec2base(e,2);//converting decimal to binary--------->before point part of resultant binary number

+disp(z2)

+g1=dec2base(g,2);//converting decimal to binary--------->after point part of  resultant binary number

+disp(g1)

+//NOTE:here floating point decimal cannot be directly converted to binary for second case.Hence computed to binary

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.7/ex15_7.sce b/1964/CH15/EX15.7/ex15_7.sce
new file mode 100755
index 000000000..2639010fc
--- /dev/null
+++ b/1964/CH15/EX15.7/ex15_7.sce
@@ -0,0 +1,25 @@
+//Chapter-15, Example 15.7, Page 497

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+//using 1's complement method

+x1=base2dec(['1111'],2)//converting binary to decimal

+x=bin2dec('1010')

+x2=dec2bin(bitcmp(x,4))//1's complement of a number

+disp(x2)

+x3=base2dec([x2],2)

+x4=x1+x3;

+x5=dec2base(x4,2)//converting decimal to hexadecimal

+disp(x5)

+y=15;

+z=bitand(x4,y);//eliminating carry

+z1=bitset(z,1);//setting 1st bit t0 1

+z2=dec2base(z1,2)//converting decimal to binary

+disp(z2)

+//using normal method

+a=base2dec(['1111','1010'],2);//converting binary to decimal

+b=a(1)-a(2);//subtraction

+c=dec2base(b,2)//converting decimal to binary

+disp(c)

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.8/ex15_8.sce b/1964/CH15/EX15.8/ex15_8.sce
new file mode 100755
index 000000000..d8c7b0f54
--- /dev/null
+++ b/1964/CH15/EX15.8/ex15_8.sce
@@ -0,0 +1,24 @@
+//Chapter-15, Example 15.8, Page 498

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+//using 1's complement method

+x1=base2dec(['1000'],2)//converting binary to decimal

+x=bin2dec('1010')

+x2=dec2bin(bitcmp(x,4))//1's complement of a number

+disp(x2)

+x3=base2dec([x2],2)

+x4=x1+x3;

+x5=dec2base(x4,2)//converting decimal to hexadecimal

+disp(x5)

+y=15;

+z=bitand(x4,y);//eliminating carry

+z2=dec2base(z,2)//converting decimal to binary

+disp(z2)

+//using normal method

+a=base2dec(['1000','1010'],2);//converting binary to decimal

+b=a(2)-a(1);//subtraction

+c=dec2base(b,2)//converting decimal to binary

+disp(c);//since we cannot use dec2base for negative integers,we cannot do (a(1)-a(2)) but we can do (a(2)-a(1)),with '-' sign added before the result.hence 'c' here is actually -'c'

+//=================================END OF PROGRAM=======================================================================================================

diff --git a/1964/CH15/EX15.9/ex15_9.sce b/1964/CH15/EX15.9/ex15_9.sce
new file mode 100755
index 000000000..8595d2df4
--- /dev/null
+++ b/1964/CH15/EX15.9/ex15_9.sce
@@ -0,0 +1,24 @@
+//Chapter-15, Example 15.9, Page 497

+//=============================================================================

+clc

+clear

+//CALCULATIONS

+//using 1's complement method

+x1=base2dec(['1111'],2)//converting binary to decimal

+x=bin2dec('1010')

+x2=dec2bin(bitcmp(x,4))//1's complement of a number

+disp(x2)

+x3=base2dec([x2],2)

+x4=x1+x3+1;

+x5=dec2base(x4,2)//converting decimal to hexadecimal

+disp(x5)

+y=15;

+z=bitand(x4,y);//eliminating carry

+z2=dec2base(z,2)//converting decimal to binary

+disp(z2)

+//using normal method

+a=base2dec(['1111','1010'],2);//converting binary to decimal

+b=a(1)-a(2);//subtraction

+c=dec2base(b,2)//converting decimal to binary

+disp(c)

+//=================================END OF PROGRAM=======================================================================================================