initial commit / add all books

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diff --git a/659/CH12/EX12.3/exm12_3.sce b/659/CH12/EX12.3/exm12_3.sce
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+//                     Example12.3

+//A  program to open a file named INVENTORY and store in it the following

+// data: Item name   Number     Price    Quantity

+//        AAA-1      111       17.50     115

+//        BBB-2      125       36.00     75

+//        C-3        247       31.75     104

+//Extend the program to read this data from the file INVENTORY and display 

+//inventory table with the value of each item.

+

+disp("Input file name");

+filename=scanf("%s");    //Read file name that is 'INVENTORY'

+fp=mopen(filename,'w');  //Open file in write mode,fp is file descriptor

+disp("Input inventory data");

+disp("Item name     Number     Price     Quantity");

+for i=1:3

+    //read data from terminal

+  [n,item(i),number(i),price(i),quantity(i)]=mscanf("%s %d %f %d");

+  //write data to the file

+   mfprintf(fp,'%s\t%d\t%.2f\t%d\n',item(i),number(i),price(i),quantity(i));

+end

+mclose(fp);              //close the file

+fp=mopen(filename,'r');  //open file in read mode

+disp("Item name   Number   Price   Quantity   Value");

+for i=1:3

+    //Read data from the file 'INVENTORY'

+    [n,item,number,price,quantity]=mfscanf(fp,"%s %d %f %d");

+     value=price*quantity;  //Computes value

+     //Printing of the data 

+     printf('   %s   %7d %8.2f %8d %11.2f\n',item,number,price,quantity,value);

+end

+mclose(fp);