1.输入任意一个十进制整数，用栈实现将其转换为对应的二进制、八进制和十六进制，并打印输出，要求在devc++下写出代码

将十进制整数转换成二进制、八进制和十六进制，可以使用栈数据结构以及三位一组（对于十六进制）的方式来存储数字。以下是使用Dev-C++编写的一个简单的示例代码：

#include <iostream>
#include <stack>
using namespace std;

// Function to convert decimal to binary and push it onto the stack
void decToBinary(int num, stack<char>& binStack) {
    while (num > 0) {
        binStack.push((char)(num % 2 + '0')); // Convert to char and add prefix '0'
        num /= 2;
    }
}

// Function to convert decimal to octal and push it onto the stack
void decToOctal(int num, stack<char>& octStack) {
    for (int i = 0; i < 3; i++) {
        int digit = num % 8;
        octStack.push((char)(digit + '0'));
        num /= 8;
    }
    reverse(octStack.begin(), octStack.end()); // Reverse the stack since we pushed from right
}

// Function to convert decimal to hexadecimal and push it onto the stack
void decToHexadecimal(int num, stack<char>& hexStack) {
    stack<char> tempStack;
    for (int i = 0; i < 4; i++) {
        int digit = num % 16;
        if (digit < 10)
            tempStack.push((char)(digit + '0'));
        else
            tempStack.push((char)(digit - 10 + 'A'));

        num /= 16;
    }
    reverse(tempStack.begin(), tempStack.end());
    for (auto it : tempStack)
        hexStack.push(it);
}

// Print the stacks
void printStack(stack<char>& stack, string type) {
    cout << "Converting to " << type << ": ";
    while (!stack.empty()) {
        cout << stack.top();
        stack.pop();
    }
    cout << endl;
}

int main() {
    int decimalNum;
    cout << "Enter a decimal number: ";
    cin >> decimalNum;

    stack<char> binStack, octStack, hexStack;
    
    decToBinary(decimalNum, binStack);
    decToOctal(decimalNum, octStack);
    decToHexadecimal(decimalNum, hexStack);

    printStack(binStack, "Binary");
    printStack(octStack, "Octal");
    printStack(hexStack, "Hexadecimal");

    return 0;
}

当你运行这个程序并输入一个十进制数时，它会输出相应的二进制、八进制和十六进制表示。