12 files changed, 231 insertions, 0 deletions
diff --git a/659/CH12/EX12.1/exm12_1.sce b/659/CH12/EX12.1/exm12_1.sce
new file mode 100755
index 000000000..c5ab08b6a
--- /dev/null
+++ b/659/CH12/EX12.1/exm12_1.sce
@@ -0,0 +1,24 @@
+//                    Example 12.1
+// Write a program to read data from keyboard,write it to a file called INPUT,
+// again read the same data from the INPUT file and display it on the screen.
+
+warning('off');
+disp("Data Input");
+
+//Open the file INPUT
+f1=mopen('INPUT.txt','w');
+// Get character from keyboard
+c=read(%io(1),1,1,'(a)');
+mfprintf(f1,'%s',c);
+
+//close the file input
+mclose(f1);
+
+
+disp("Data Output");
+//Reopen the file INPUT
+f1=mopen('INPUT.txt','r');
+     txt=mgetl(f1);
+     printf("%s",text);
+//close the file input
+mclose(f1);
diff --git a/659/CH12/EX12.1/exm12_1_output.PNG b/659/CH12/EX12.1/exm12_1_output.PNG
new file mode 100755
index 000000000..568022792
--- /dev/null
+++ b/659/CH12/EX12.1/exm12_1_output.PNG
diff --git a/659/CH12/EX12.2/exm12_2.sce b/659/CH12/EX12.2/exm12_2.sce
new file mode 100755
index 000000000..7c8bad3ad
--- /dev/null
+++ b/659/CH12/EX12.2/exm12_2.sce
@@ -0,0 +1,61 @@
+//                     Example12.2
+//A  file named DATA contains a series of integer numbers. Code a program
+//to read these numbers and then write all 'odd' numbers to a file to be 
+//called ODD and all 'even' numbers to a file to be called EVEN.
+
+warning('off');
+//Input numbers in the DATA.txt file
+printf("Contents of DATA file\n");
+f1=mopen('DATA.txt','wt');
+for i=1:30
+    number(i)=scanf("%d");
+    if(number(i) == -1)
+        break;
+    end
+     mfprintf(f1,'%d\n',number(i));
+end
+mclose(f1);
+
+f2=mopen('ODD.txt','wt');
+f3=mopen('EVEN.txt','wt');
+f1=mopen('DATA.txt','rt');
+//Read numbers from DATA file
+EOF=length(number);
+i=1;
+even=0;
+odd=0;
+while (i<EOF)
+    [n,number]=mfscanf(f1," %d")
+     if(pmodulo(number,2)==0)
+        mfprintf(f3,'%d\n',number);
+        even=even+1;
+    else
+        mfprintf(f2,'%d\n',number);
+        odd=odd+1;
+    end
+    i=i+1;
+end
+mclose(f1);
+mclose(f2);
+mclose(f3);
+//Write odd numbers in the ODD.txt file
+f2=mopen('ODD.txt','rt');
+printf("\nContents of ODD file\n");
+i=1;
+while (i<=odd)
+    [n,number]=mfscanf(f2,"%d")
+    printf("%4d",number); 
+    i=i+1;   
+end
+//Write even numbers in the EVEN.txt file
+f3=mopen('EVEN.txt','rt');
+printf("\nContents of EVEN file\n");
+i=1;
+while (i<=even)
+    [n,number]=mfscanf(f3,"%d")
+    printf("%4d",number); 
+    i=i+1;   
+end
+//close the files
+mclose(f2);
+mclose(f3);
diff --git a/659/CH12/EX12.2/exm12_2_output.PNG b/659/CH12/EX12.2/exm12_2_output.PNG
new file mode 100755
index 000000000..a436e4600
--- /dev/null
+++ b/659/CH12/EX12.2/exm12_2_output.PNG
diff --git a/659/CH12/EX12.3/exm12_3.sce b/659/CH12/EX12.3/exm12_3.sce
new file mode 100755
index 000000000..8475affee
--- /dev/null
+++ b/659/CH12/EX12.3/exm12_3.sce
@@ -0,0 +1,31 @@
+//                     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);
diff --git a/659/CH12/EX12.3/exm12_3_output.PNG b/659/CH12/EX12.3/exm12_3_output.PNG
new file mode 100755
index 000000000..9a83c48e9
--- /dev/null
+++ b/659/CH12/EX12.3/exm12_3_output.PNG
diff --git a/659/CH12/EX12.4/exm12_4.sce b/659/CH12/EX12.4/exm12_4.sce
new file mode 100755
index 000000000..14262ed8e
--- /dev/null
+++ b/659/CH12/EX12.4/exm12_4.sce
@@ -0,0 +1,38 @@
+//                     Example12.4
+//Write a program to illustatre error handling in file operations.
+
+warning('off');
+fp1=mopen('TEST','w');  //Open file in write mode,fp1 is file descriptor
+for i=10:10:100
+   //write data to the file
+   mfprintf(fp1,'%d\n',i);
+end
+mclose(fp1);
+disp("Input file name");
+filename='a';
+while(filename~=' ')
+    filename=scanf("%s");
+    //Error handling
+    try 
+        fp2=mopen(filename,'r');
+        if(fp2>0) ,
+            break;         //Terminates the loop if file exist or opened
+        end
+        
+    catch
+        //Messages to be displayed when error occured
+        printf("Can not open file.\n");
+        printf("Type file name again.\n");
+    end
+end
+//Code below runs while there is no error
+for i=1:20
+    number = mfscanf(fp2,"%d");  //Read data from file 'TEST'
+    if meof(fp2) then            //Test for end of file
+       printf("Ran out of data");
+       break;
+     else
+        printf("%d\n",number);   //prints the data
+      end
+end
+mclose(fp2);
+\ No newline at end of file
diff --git a/659/CH12/EX12.4/exm12_4_output.PNG b/659/CH12/EX12.4/exm12_4_output.PNG
new file mode 100755
index 000000000..b948c5dac
--- /dev/null
+++ b/659/CH12/EX12.4/exm12_4_output.PNG
diff --git a/659/CH12/EX12.5/exm12_5.sce b/659/CH12/EX12.5/exm12_5.sce
new file mode 100755
index 000000000..0f8b82e2a
--- /dev/null
+++ b/659/CH12/EX12.5/exm12_5.sce
@@ -0,0 +1,31 @@
+//                    Example12.5
+//Write a program that uses function ftell(mtell) and fseek(mseek).
+
+warning('off');
+//Open file 'RANDOM' in write mode,fp is file descriptor
+fp=mopen('RANDOM','w'); 
+c=read(%io(1),1,1,'(a)');
+mfprintf(fp,'%s',c);    //write data to the file
+printf("Number of characters entered = %d\n",mtell(fp));
+mclose(fp);
+
+//Open file 'RANDOM' in read mode
+fp=mopen('RANDOM','r');
+n=0;
+while(meof(fp)==0)
+//n is the offset from origin in number of bytes.
+//The new position is at the signed distance given by n bytes from the beginning
+    mseek(n,fp,'set');
+    //Print the chracter  and its postion
+    printf("Position of %c is %d\n",ascii(mget(1,'c',fp)),mtell(fp));
+    n=n+5;
+end
+n=0;     //Initial offset
+while(mtell(fp)>1)
+ //New position is at the signed distance given by n bytes from the end
+      mseek(n,fp,'end');
+      //Print the characters from the end
+      printf("%c",(ascii(mget(1,'c',fp))));
+      n=n-1;
+end
+mclose(fp);
diff --git a/659/CH12/EX12.5/exm12_5_output.PNG b/659/CH12/EX12.5/exm12_5_output.PNG
new file mode 100755
index 000000000..bb468ccca
--- /dev/null
+++ b/659/CH12/EX12.5/exm12_5_output.PNG
diff --git a/659/CH12/EX12.6/exm12_6.sce b/659/CH12/EX12.6/exm12_6.sce
new file mode 100755
index 000000000..17cf059fc
--- /dev/null
+++ b/659/CH12/EX12.6/exm12_6.sce
@@ -0,0 +1,46 @@
+//                     Example 12.6
+//Write a program to append additional items to the file INVENTORY 
+//created in Example 12.3 and print the total contents of the file.
+funcprot(0);
+warning('off');
+function[item] =append(product,fp)
+    printf("Item name:\n");
+    product.name=scanf("%s");
+    printf("Item number:.\n");
+    product.number=scanf("%d");
+    printf("Item price\n");
+    product.price=scanf("%f");
+    printf("Quantity:\n");
+    product.quantity=scanf("%d");
+    //Write data in the file
+     mfprintf(fp,'%s %d %.2f %d\n',product.name,product.number,product.price,product.quantity);
+     item=product;
+endfunction
+//Creating structure
+item=struct('name','0','number','0','price','0','quantity','0');
+//Read file name that is 'INVENTORY'
+disp("Type file name");
+filename=scanf("%s");
+//Open file in append mode,fp is file descriptor
+fp=mopen(filename,'a+');  
+b=0;response=-1;
+//Read data 
+while(response==1|b==0)
+    item=append(item,fp);  //calling append() function
+    printf("Item %s appended.\n",item.name);
+    printf("Do you want to add another item\(1 for YES/0 for NO)?");
+    response=scanf("%d");
+    b=1;
+end
+n=mtell(fp);     //position of last character
+mclose(fp);
+
+//Opening file in the read mode
+fp=mopen(filename,'r');
+while (mtell(fp) < n-2)
+  //read data from terminal
+  [g,item.name,item.number,item.price,item.quantity]=mfscanf(fp,"%s %d %f %d");
+  //Print Data to screen
+   printf('%s %7d %8.2f %8d\n',item.name,item.number,item.price,item.quantity);
+end
+mclose(fp);
diff --git a/659/CH12/EX12.6/exm12_6_output.PNG b/659/CH12/EX12.6/exm12_6_output.PNG
new file mode 100755
index 000000000..2ff06cfea
--- /dev/null
+++ b/659/CH12/EX12.6/exm12_6_output.PNG