Exercise 3.4 A Calculator that allows multiple calculations

Exercise 3-4. Modify The last example in the chapter then implemented a calculator so
That the user was given the option to enter Y or Y to carry out another calculation, and N or
N to end of the program. (Note:you ' ll has a goto statement for this
Learn a better the doing this in the next chapter.)

My:

1#include <stdio.h>2 intMain ()3 {4     DoubleNumber1 =0.0;5     DoubleNumber2 =0.0;6     CharOperation =0;7     8 Start:9printf"/nenter The calculation");Tenscanf"%lf%c%lf", &number1, &operation, &number2); One      A     Switch(Operation) -     { -          Case '+': theprintf"=%lf\n", Number1 +number2); -              Break; -          Case '-': -printf"%lf\n", &number1-&number2); +              Break; -          Case'*': +printf"%lf\n", &number1 * &number2); A              Break; at          Case'/': -             if(Number2 = =0)//Check the second operand for zero -printf"\n\n\a division by Zero Erro\n"); -                  Break; -             Else  -printf"%lf\n", &number/&number2); in                  Break; -          Case'%': to             if((Long) Number2 =0;) +printf"\n\n\adivision by Zero erro\n"); -                  Break; the             Else *printf"%lf\n", (Long) Number1% (Long) number2); $                  Break;Panax Notoginseng         default: -printf"\n\n\aillegal operation\n"); the              Break;  +     } A      the     //The followoing statements added to prompt for continuing +     CharAnswer ='N'; -printf"\ Want to do another calculation? (Y or n);"); $scanf"%c", &answer); $     if(answer=='y'|| Answer = ='y'); -Go to start;//go back to the beginning -          the         return 0; -     Wuyi}

Original:

1 /*Exercise 3.4 A calculator that allows multiple calculations*/2#include <stdio.h>3 4 intMainvoid)5 {6   DoubleNumber1 =0.0;/*First operand value a decimal number*/7   DoubleNumber2 =0.0;/*Second operand value a decimal number*/8   CharOperation =0;/*operation-must be +,-, *,/, or%*/9 Start:Tenprintf"\nenter the calculation\n"); Onescanf"%lf%c%lf", &number1, &operation, &number2); A  -   Switch(Operation) -   { the      Case '+'://No checks necessary for add -printf"=%lf\n", Number1 +number2); -        Break; -  +      Case '-'://No checks necessary for subtract -printf"=%lf\n", Number1-number2); +        Break; A  at      Case '*'://No checks necessary for multiply -printf"=%lf\n", Number1 *number2); -        Break;  -  -      Case '/': -       if(Number2 = =0)//Check second operand for zero inprintf"\n\n\adivision by Zero error!\n"); -       Else toprintf"=%lf\n", Number1/number2); +        Break; -  the      Case '%'://Check second operand for zero *       if((Long) Number2 = =0)  $printf"\n\n\adivision by Zero error!\n");Panax Notoginseng       Else -printf"=%ld\n", (Long) Number1% (Long) number2); the        Break; +  A     default://operation is invalid if we get to here theprintf"\n\n\aillegal operation!\n"); +        Break; -   } $  $   /*The following statements added to prompt for continuing*/ -   CharAnswer ='N'; -printf"\ Want to do another calculation? (Y or N):"); thescanf"%c", &answer); -   if(Answer = ='y'|| Answer = ='Y')Wuyi     GotoStart/*Go back to the beginning*/ the  -   return 0; Wu}

Exercise 3.4 A Calculator that allows multiple calculations