Do 3,4 and 7

3. Complete TRY THIS Exercise 1, and then modify the code so that the true path displays "Not equal" and the false path displays "Equal". 4. Write the C++code to display the message "Entry error" when the value in the units variable is less than or equal to 0 . Otherwise, calculate the total owed by multiplying the units variable's value by 5 . Store the total owed in the total variable, and then display the total owed. 7. Correct the errors in the lines of code shown in Figure 5-37. The code variable has the char data type. if (toupper(code) =(x) cout "Discontinued" end1; else cout "Available" end1; cout "The item wi11 be shipped ASAP" end1; //end if