devc++编写界面计算器有+-*/和括号

好的，我可以帮你解决这个问题。你可以使用Dev-C++集成开发环境中的图形用户界面库来创建一个简单的计算器程序。以下是一个简单的示例代码，可以实现基本的数学计算和括号运算：

#include <graphics.h>
#include <conio.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

#define MaxSize 100

int stack[MaxSize];
int top = -1;

// 定义计算器按键的位置和尺寸
int button_left = 50;
int button_top = 100;
int button_width = 50;
int button_height = 50;

void push(int x) {
    if (top == MaxSize - 1) {
        printf("Stack is full!\n");
    } else {
        top++;
        stack[top] = x;
    }
}

int pop() {
    if (top == -1) {
        printf("Stack is empty!\n");
        return -1;
    } else {
        int x = stack[top];
        top--;
        return x;
    }
}

void draw_button(char* text, int x, int y) {
    setcolor(WHITE);
    rectangle(x, y, x + button_width, y + button_height);
    outtextxy(x + 10, y + 10, text);
}

void draw_digit_buttons() {
    char text[2];
    int x = button_left;
    int y = button_top;

    for (int i = 0; i <= 9; i++) {
        text[0] = '0' + i;
        text[1] = '\0';
        draw_button(text, x, y);

        x += button_width;
        if ((i + 1) % 3 == 0) {
            x = button_left;
            y += button_height;
        }
    }
}

void draw_operator_buttons() {
    draw_button("+", button_left + button_width * 3, button_top);
    draw_button("-", button_left + button_width * 3, button_top + button_height);
    draw_button("*", button_left + button_width * 3, button_top + button_height * 2);
    draw_button("/", button_left + button_width * 3, button_top + button_height * 3);
    draw_button("(", button_left + button_width * 4, button_top);
    draw_button(")", button_left + button_width * 4, button_top + button_height);
}

void draw_equal_button() {
    draw_button("=", button_left + button_width * 2, button_top + button_height * 4);
}

void draw_clear_button() {
    draw_button("C", button_left + button_width * 3, button_top + button_height * 4);
}

void draw_all_buttons() {
    draw_digit_buttons();
    draw_operator_buttons();
    draw_equal_button();
    draw_clear_button();
}

void evaluate_expression(char* expression) {
    int len = strlen(expression);
    int i = 0;

    while (i < len) {
        if (isdigit(expression[i])) {
            int num = 0;
            while (i < len && isdigit(expression[i])) {
                num = num * 10 + (expression[i] - '0');
                i++;
            }
            push(num);
        } else if (expression[i] == '+' || expression[i] == '-' || expression[i] == '*' || expression[i] == '/') {
            int b = pop();
            int a = pop();
            int result = 0;
            switch (expression[i]) {
                case '+':
                    result = a + b;
                    break;
                case '-':
                    result = a - b;
                    break;
                case '*':
                    result = a * b;
                    break;
                case '/':
                    result = a / b;
                    break;
            }
            push(result);
            i++;
        } else if (expression[i] == '(') {
            push(-1);
            i++;
        } else if (expression[i] == ')') {
            int result = 0;
            while (stack[top] != -1) {
                result += pop();
            }
            pop();
            push(result);
            i++;
        } else {
            i++;
        }
    }

    printf("%s = %d\n", expression, pop());
}

int main() {
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    draw_all_buttons();

    char expression[MaxSize];
    int pos = 0;

    while (true) {
        if (kbhit()) {
            char ch = getch();

            if (ch == 'C' || ch == 'c') {
                // 清空输入
                pos = 0;
                setcolor(BLACK);
                rectangle(button_left, button_top - 20, button_left + button_width * 5, button_top - 5);
                continue;
            } else if (ch == '=') {
                // 计算表达式
                expression[pos] = '\0';
                evaluate_expression(expression);
                pos = 0;
                setcolor(BLACK);
                rectangle(button_left, button_top - 20, button_left + button_width * 5, button_top - 5);
                continue;
            }

            // 显示输入的字符
            setcolor(WHITE);
            outtextxy(button_left + pos * button_width, button_top - 20, &ch);

            // 添加到表达式中
            expression[pos++] = ch;
        }
    }

    closegraph();

    return 0;
}

这个程序使用了 Dev-C++ 集成开发环境中的图形用户界面库，通过鼠标点击计算器按钮来输入数字和运算符，并且支持括号运算。在这个程序中，我们使用一个栈来计算表达式的值。你可以根据自己的需求来修改这个程序，并添加更多的功能。