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104 Zeilen
2.3 KiB
104 Zeilen
2.3 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <setjmp.h>
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/*
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* SIGFPE bisa nempel di CPU, perlu dicari solusi
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* Test openssl lewat socat
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*/
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void signal_handler(int sig)
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{
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signal(SIGFPE, signal_handler);
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system("/bin/sh");
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exit(1);
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}
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int main(int argc, char const *argv[])
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{
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int i_a = 0;
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int i_b = 0;
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int total = 0;
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setvbuf(stdin, NULL, _IONBF, 0);
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setvbuf(stdout, NULL, _IONBF, 0);
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setvbuf(stderr, NULL, _IONBF, 0);
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signal(SIGFPE, signal_handler);
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puts("Welcome to Online Calculator v3.1");
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puts("");
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puts("Operator supported: + - * /");
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puts("ex: 2 + 2");
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puts("ex: 2 + a //'a' to use last results");
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puts("");
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puts("------------------------------------");
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while (1)
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{
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char c_a[11] = "";
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char c_b[11] = "";
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char opt = 0;
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printf(">");
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if (scanf("%10s %c %10s", c_a, &opt, c_b) < 3)
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{
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puts("Failed to parse expression!");
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return 0;
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}
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else
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{
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int r1_a = sscanf(c_a, "%d", &i_a);
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int r2_a = strcmp("a", c_a) == 0;
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int r1_b = sscanf(c_b, "%d", &i_b);
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int r2_b = strcmp("a", c_b) == 0;
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if ((i_b == 0 && r2_a) && opt == '/')
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{
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puts("Floating point exception (core dumped)");
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return 0;
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}
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if (r2_a)
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{
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i_a = total;
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}
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if (r2_b)
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{
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i_b = total;
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}
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if ((r1_a || r2_a) && (r1_b || r2_b))
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{
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switch (opt)
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{
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case '+':
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total = i_a + i_b;
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break;
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case '-':
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total = i_a - i_b;
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break;
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case '*':
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total = i_a * i_b;
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break;
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case '/':
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total = i_a / i_b;
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break;
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default:
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puts("Unknown operator!");
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return 0;
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}
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printf("=%d\n", total);
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}
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else
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{
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puts("Failed to parse operand!");
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return 0;
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}
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}
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}
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return 0;
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}
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