Update homework 1 and 2

examples/.gitignore

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+*.exe

examples/hw1/cond_and_loop.c

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+int main() {
+    int i;
+    int p = 2;
+    int q = 5;
+    int r = (0 ? ((p > q) ? (p -= 2) : (p += 2)) : (p + q));
+
+    for (i = 0; i < 11; ((i % 2) ? (i += 2) : ++i)) {
+        if (i % 2) { p += q; }
+        else { p += r; } 
+    }
+
+    return p == 34;
+}

examples/hw1/gcd.c

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+int gcd(int a, int b) {
+    a = (a > 0) ? a : -a;
+    b = (b > 0) ? b : -b;
+
+    while(a != b) {
+        if(a > b) { a -= b; }
+        else { b -= a; }
+    }
+
+    return a;
+}
+
+int main() {
+    return gcd(18, 21) == 3;
+}

examples/meta/make_cond.py

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+#!/usr/bin/env python3
+
+"""Make c program which uses complicated conditional expression
+
+To make c program, execute `python3 make_cond.py > file_name.c`
+"""
+
+import random
+
+def eval_cond(arr_cond):
+    """Evaluate conditional expression
+    """
+    if len(arr_cond) == 1:
+        return arr_cond[0]
+    new_arr_cond = []
+    for cond_start in range(len(arr_cond) // 3):
+        cond_val = arr_cond[3*cond_start + 1] if arr_cond[3*cond_start] else arr_cond[3*cond_start + 2]
+        new_arr_cond.append(cond_val)
+    return eval_cond(new_arr_cond)
+
+def make_func(i):
+    """Make a function that contains a conditional expression
+    """
+    func_signature = "int " + "func_" + str(i) + "()"
+    variables = "abcdefghijklmnopqrstuvwxyzA"
+    func_inner = []
+    val_bitmap = []
+
+    # Variable initializiation
+    for var in variables:
+        val = random.randint(0, 1)
+        val_bitmap.append(val)
+        decl = "\tint " + var + " = " + str(val) + ";"
+        func_inner.append(decl)
+
+    expr_val = eval_cond(val_bitmap)
+    func_inner.append("\treturn (((a ? b : c) ? (d ? e : f) : (g ? h : i)) ? ((j ? k : l) ? (m ? n : o) : (p ? q : r)) : ((s ? t : u) ? (v ? w : x) : (y ? z : A))) == " + str(expr_val) + ";")
+
+    return "\n".join([func_signature, "{"] + func_inner + ["}"])
+
+if __name__ == "__main__":
+    src = ""
+    return_stmt = "\treturn ("
+    NUM_FUNC = 100
+    for i in range(NUM_FUNC):
+        src += make_func(i)
+        src += "\n\n"
+        return_stmt += "func_" + str(i) + "()"
+        return_stmt += " && " if i != (NUM_FUNC - 1) else ") == "
+    return_stmt += "1;"
+    src += "int main()\n{\n" + return_stmt + "\n}\n"
+
+    print(src)

examples/simple_cond.c

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+int f(int x) {
+    return x + 8;
+}
+
+int main() {
+    int x = 0;
+    int y = (x++ == 1) ? 1 : 2;
+
+    return f((x < y) ? x : 2) == 9;
+}