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| 1 | public static int calculate(String input){
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| 2 | int lhs,rhs; //short for left-hand & right-hand side | |
| 3 | char operation; | |
| 4 | Scanner scanner = new Scanner(input); | |
| 5 | lhs = scanner.nextInt(); | |
| 6 | while(scanner.hasNext()) {
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| 7 | operation = scanner.next().charAt(0); | |
| 8 | rhs = scanner.nextInt(); | |
| 9 | - | lhs = lhs + operation + rhs; |
| 9 | + | switch(operation) {
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| 10 | case '+': | |
| 11 | lhs += rhs; | |
| 12 | break; | |
| 13 | case '-': | |
| 14 | lhs -= rhs; | |
| 15 | break; | |
| 16 | case '*': | |
| 17 | lhs *= rhs; | |
| 18 | break; | |
| 19 | case '/': | |
| 20 | lhs /= rhs; | |
| 21 | break; | |
| 22 | default: | |
| 23 | //error!! wrong operation, do something | |
| 24 | break; | |
| 25 | } | |
| 26 | System.out.println(lhs); | |
| 27 | ||
| 28 | } | |
| 29 | ||
| 30 | ||
| 31 | ||
| 32 | ||
| 33 | ||
| 34 | /*todo: your name and code goes here*/ | |
| 35 | /*You need a Scanner(or StringTokenizer) to get tokens | |
| 36 | *Then you need a loop, and switch inside that loop*/ | |
| 37 | return lhs; | |
| 38 | } |
