68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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double calculate(char op, double num1, double num2) {
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double result = 0;
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switch (op) {
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case '+':
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result = num1 + num2;
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break;
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case '-':
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result = num1 - num2;
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break;
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case '*':
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result = num1 * num2;
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break;
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case '/':
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result = num1 / num2;
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break;
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}
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return result;
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}
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int main() {
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double number = 0;
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double tmpNumber = 0;
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char input;
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char operator;
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while (1) {
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scanf(" %c", &input);
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switch (input) {
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case '+':
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operator = '+';
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tmpNumber = number;
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number = 0;
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break;
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case '-':
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operator = '-';
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tmpNumber = number;
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number = 0;
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break;
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case '*':
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operator = '*';
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tmpNumber = number;
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number = 0;
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break;
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case '/':
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operator = '/';
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tmpNumber = number;
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number = 0;
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break;
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case '=':
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printf("%lf\n", calculate(operator, tmpNumber, number));
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tmpNumber = 0;
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number = 0;
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break;
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case 'q':
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goto exit;
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// operator doesn't match any case constant
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default:
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number = (number * 10) + atof(&input);
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printf("%.1lf\n", number);
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}
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}
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exit:
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return 0;
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}
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