import sys

def generate_subfunction(file, start, end):
    file.write(f"int is_even_{start}_{end}(int num) {{\n")
    conditions = ""
    for i in range(start, end + 1):
        even_check = "1" if i % 2 == 0 else "0"
        conditions += f"(num == {i}) ? {even_check} : "
    conditions += "0"
    file.write(f"    return {conditions};\n")
    file.write("}\n\n")

def generate_c_file(max_number):
    with open("is_even.c", "w") as file:
        # Write the headers
        file.write("#include <stdio.h>\n\n")

        # Generate subfunctions in chunks of 10,000
        for i in range(1, max_number + 1, 10000):
            start = i
            end = min(i + 9999, max_number)
            generate_subfunction(file, start, end)

        # Generate the main is_even function
        file.write("int is_even(int num) {\n")
        for i in range(1, max_number + 1, 10000):
            start = i
            end = min(i + 9999, max_number)
            file.write(f"    if (num >= {start} && num <= {end}) return is_even_{start}_{end}(num);\n")
        file.write("    return 0;\n")
        file.write("}\n\n")

        # Write the main function
        file.write("int main() {\n")
        file.write("    for (int i = 1; i <= {0}; i++) {{\n".format(max_number))
        file.write("        printf(\"%d is %s\\n\", i, is_even(i) ? \"even\" : \"odd\");\n")
        file.write("    }\n")
        file.write("    return 0;\n")
        file.write("}\n")

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("Usage: python generate_c.py <max_number>")
    else:
        max_number = int(sys.argv[1])
        generate_c_file(max_number)