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+            //Example 7.8
+//convert a lowercase character to uppercase using a programmer defined function
+funcprot(0);
+
+function[c2] = lower_to_upper (c1)                //function definition
+//as conditional (?:) operater is not present in scilab, so we need to use if-else instead.
+    if (ascii(c1) >= ascii('a')) &(ascii(c1) <= ascii('z')) then
+        c2=ascii(ascii('A')+ascii(c1)- ascii('a'));
+    else
+        c2=c1;
+    end
+    return c2;
+endfunction
+
+function[] = main()
+    printf("Please enter a lowercase character: ");
+    lower= scanf("%c");
+    upper= lower_to_upper (lower);                       //function call
+    printf("\n The uppercase equivalent is %c\n\n",upper);
+endfunction
+
+//calling main function.
+main();
+\ No newline at end of file