用ege做一个计算器 的代码

以下是使用ege库实现简单计算器的代码：

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

#define WIDTH 270
#define HEIGHT 360

int main() {
    initgraph(WIDTH, HEIGHT);
    setbkcolor(WHITE);

    char input[20] = "";
    int x = 10, y = 10;
    outtextxy(x, y, "Calculator");

    settextstyle(10, 0, 3);
    setcolor(BLACK);
    rectangle(x, y + 50, x + 250, y + 290);

    settextstyle(10, 0, 2);
    int i = 0, j = 0;
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            char num[2];
            sprintf(num, "%d", i * 3 + j + 1);
            rectangle(x + j * 80, y + i * 80 + 60, x + j * 80 + 70, y + i * 80 + 140);
            outtextxy(x + j * 80 + 30, y + i * 80 + 100, num);
        }
    }

    outtextxy(x + 30, y + 300, "0");
    rectangle(x + 80, y + 300, x + 160, y + 340);
    outtextxy(x + 110, y + 310, ".");
    rectangle(x, y + 300, x + 70, y + 340);
    outtextxy(x + 30, y + 310, "C");
    rectangle(x + 170, y + 60, x + 250, y + 100);
    outtextxy(x + 190, y + 80, "+");
    rectangle(x + 170, y + 120, x + 250, y + 160);
    outtextxy(x + 190, y + 140, "-");
    rectangle(x + 170, y + 180, x + 250, y + 220);
    outtextxy(x + 190, y + 200, "*");
    rectangle(x + 170, y + 240, x + 250, y + 280);
    outtextxy(x + 190, y + 260, "/");

    while (1) {
        char ch = getch();
        if (ch >= '0' && ch <= '9') {
            input[strlen(input)] = ch;
            outtextxy(x + 15, y + 310, input);
        }
        else if (ch == '.') {
            if (strchr(input, '.') == NULL) {
                input[strlen(input)] = ch;
                outtextxy(x + 15, y + 310, input);
            }
        }
        else if (ch == '+' || ch == '-' || ch == '*' || ch == '/') {
            char num[20];
            double a = atof(input);
            memset(input, 0, sizeof(input));
            sprintf(num, "%.2f", a);
            outtextxy(x + 15, y + 310, num);
            input[strlen(input)] = ch;
        }
        else if (ch == 8) {
            if (strlen(input) > 0) {
                input[strlen(input) - 1] = '\0';
                cleardevice();
                setbkcolor(WHITE);
                outtextxy(x, y, "Calculator");

                settextstyle(10, 0, 3);
                setcolor(BLACK);
                rectangle(x, y + 50, x + 250, y + 290);

                settextstyle(10, 0, 2);
                int i = 0, j = 0;
                for (i = 0; i < 3; i++) {
                    for (j = 0; j < 3; j++) {
                        char num[2];
                        sprintf(num, "%d", i * 3 + j + 1);
                        rectangle(x + j * 80, y + i * 80 + 60, x + j * 80 + 70, y + i * 80 + 140);
                        outtextxy(x + j * 80 + 30, y + i * 80 + 100, num);
                    }
                }

                outtextxy(x + 30, y + 300, "0");
                rectangle(x + 80, y + 300, x + 160, y + 340);
                outtextxy(x + 110, y + 310, ".");
                rectangle(x, y + 300, x + 70, y + 340);
                outtextxy(x + 30, y + 310, "C");
                rectangle(x + 170, y + 60, x + 250, y + 100);
                outtextxy(x + 190, y + 80, "+");
                rectangle(x + 170, y + 120, x + 250, y + 160);
                outtextxy(x + 190, y + 140, "-");
                rectangle(x + 170, y + 180, x + 250, y + 220);
                outtextxy(x + 190, y + 200, "*");
                rectangle(x + 170, y + 240, x + 250, y + 280);
                outtextxy(x + 190, y + 260, "/");
                outtextxy(x + 15, y + 310, input);
            }
        }
        else if (ch == 13) {
            double a = atof(input);
            double b = 0;
            char num[20];
            memset(input, 0, sizeof(input));
            if (strchr(num, '+') != NULL) {
                b = atof(strchr(num, '+') + 1);
                sprintf(num, "%.2f", a + b);
            }
            else if (strchr(num, '-') != NULL) {
                b = atof(strchr(num, '-') + 1);
                sprintf(num, "%.2f", a - b);
            }
            else if (strchr(num, '*') != NULL) {
                b = atof(strchr(num, '*') + 1);
                sprintf(num, "%.2f", a * b);
            }
            else if (strchr(num, '/') != NULL) {
                b = atof(strchr(num, '/') + 1);
                sprintf(num, "%.2f", a / b);
            }
            outtextxy(x + 15, y + 310, num);
        }
        else if (ch == 'c' || ch == 'C') {
            memset(input, 0, sizeof(input));
            outtextxy(x + 15, y + 310, input);
        }
    }

    getch();
    closegraph();
    return 0;
}

这个计算器只支持加、减、乘、除四种运算，并且没有考虑到负数、小数、括号以及其他高级运算。如果需要实现更复杂的计算器，可以考虑使用其他第三方库或者自己实现计算逻辑。