GTK实现简单计算器（calculator.c）

/* 计算器 calc.c */
#include <gtk/gtk.h>
#include <stdlib.h>
static GtkWidget *entry; //定义单行输入控件来显示输入输出的数字
gint count = 0 ; //计位
gdouble nn = 0 ; //计数一
gdouble mm = 0 ; //计数二
gint s = 0 ; //算法
gboolean first = TRUE; //首次输入
gboolean have_dot = FALSE; //是否有小数点
gboolean have_result = FALSE; //是否有结果输出
gchar number[100]; //保存用户输入的数字void clear_all (void)
{ //清除所有相关标记gint i;gtk_entry_set_text(GTK_ENTRY(entry),"");nn = 0;mm = 0 ;s = 0;count = 0 ;first = TRUE;have_dot = FALSE;have_result = FALSE;for(i = 0 ; i < 100 ; i++)number[i] = '\0';
}
void on_num_clicked (GtkButton* button,gpointer data)
{ //当数定键按下时执行const gchar *num;gint i;if(have_result)clear_all();//有结果则全部清除if(count == 6) return; //够6位数则不能再输入数字count++;num = gtk_button_get_label(GTK_BUTTON(button));//取数i = g_strlcat(number,num,100);//保存if(first)nn = strtod(number,NULL);//数一elsemm = strtod(number,NULL);//数二gtk_entry_set_text(GTK_ENTRY(entry),number);//显示
}
void on_dot_clicked (GtkButton* button,gpointer data)
{ //当小数点按下时gint i;if(have_result)clear_all();//全部清除if(have_dot == FALSE) //如果无小数点则可以{have_dot = TRUE;i = g_strlcat(number,".",100);gtk_entry_set_text(GTK_ENTRY(entry),number);}
//如果有小数点则不输出
}
void on_clear_clicked (GtkButton* button,gpointer data)
{clear_all();//全部清除
}
void on_suan_clicked (GtkButton* button,gpointer data)
{ //当计算按钮 +，-，*，/ 按下时gint i;switch(GPOINTER_TO_INT(data)){case 1: //"+"s = 1;gtk_entry_set_text(GTK_ENTRY(entry),"");first = FALSE ; count = 0; break;case 2: //"-"s = 2;gtk_entry_set_text(GTK_ENTRY(entry),"");first = FALSE ; count = 0; break;case 3: //"*"s = 3;gtk_entry_set_text(GTK_ENTRY(entry),"");first = FALSE ; count = 0; break;case 4: //"/"s = 4;gtk_entry_set_text(GTK_ENTRY(entry),"");first = FALSE ; count = 0; break;}have_dot = FALSE;for(i = 0 ; i < 100 ; i++) //清除数字number[i] = '\0';
}
void on_eq_clicked (GtkButton* button,gpointer data)
{ //当等号键按钮按下时double numb;gchar num[100];gchar *result;switch(s){case 1: //"+"numb = nn+mm;break;case 2: //"-"numb = nn-mm;break;case 3: //"*"numb = nn*mm;break;case 4: //"/"numb = nn/mm;break;}result = g_ascii_dtostr(num,100,numb);gtk_entry_set_text(GTK_ENTRY(entry),result);have_result = TRUE;
}
int main ( int argc , char* argv[])
{GtkWidget *window;GtkWidget *vbox;GtkWidget *hbox,*hbox1,*hbox2,*hbox3,*hbox4;GtkWidget *button;GtkWidget *label;gtk_init(&argc,&argv);window = gtk_window_new(GTK_WINDOW_TOPLEVEL);g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(gtk_main_quit),NULL);gtk_window_set_title(GTK_WINDOW(window),"计算器");// gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);gtk_container_set_border_width(GTK_CONTAINER(window),10);vbox = gtk_vbox_new(FALSE,0);gtk_container_add(GTK_CONTAINER(window),vbox);hbox = gtk_hbox_new(FALSE,0);gtk_box_pack_start(GTK_BOX(vbox),hbox,FALSE,FALSE,5);label = gtk_label_new("Calculator");gtk_box_pack_start(GTK_BOX(hbox),label,TRUE,TRUE,5);button = gtk_button_new_with_label("C");gtk_box_pack_start(GTK_BOX(hbox),button,TRUE,TRUE,5);g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_clear_clicked),NULL);entry = gtk_entry_new();gtk_widget_set_direction(entry,GTK_TEXT_DIR_RTL);gtk_box_pack_start(GTK_BOX(vbox),entry,FALSE,FALSE,5);hbox1 = gtk_hbox_new(FALSE,0);gtk_box_pack_start(GTK_BOX(vbox),hbox1,FALSE,FALSE,5);button = gtk_button_new_with_label("3");gtk_box_pack_start(GTK_BOX(hbox1),button,TRUE,TRUE,5);g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);button = gtk_button_new_with_label("2");gtk_box_pack_start(GTK_BOX(hbox1),button,TRUE,TRUE,5);g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);button = gtk_button_new_with_label("1");gtk_box_pack_start(GTK_BOX(hbox1),button,TRUE,TRUE,5);g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);button = gtk_button_new_with_label("+");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_suan_clicked),(gpointer)1);gtk_box_pack_start(GTK_BOX(hbox1),button,TRUE,TRUE,5);hbox2 = gtk_hbox_new(FALSE,0);gtk_box_pack_start(GTK_BOX(vbox),hbox2,FALSE,FALSE,5);button = gtk_button_new_with_label("6");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox2),button,TRUE,TRUE,5);button = gtk_button_new_with_label("5");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox2),button,TRUE,TRUE,5);button = gtk_button_new_with_label("4");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox2),button,TRUE,TRUE,5);button = gtk_button_new_with_label("-");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_suan_clicked),(gpointer)2);gtk_box_pack_start(GTK_BOX(hbox2),button,TRUE,TRUE,5);hbox3 = gtk_hbox_new(FALSE,0);gtk_box_pack_start(GTK_BOX(vbox),hbox3,FALSE,FALSE,5);button = gtk_button_new_with_label("9");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox3),button,TRUE,TRUE,5);button = gtk_button_new_with_label("8");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox3),button,TRUE,TRUE,5);button = gtk_button_new_with_label("7");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox3),button,TRUE,TRUE,5);button = gtk_button_new_with_label("*");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_suan_clicked),(gpointer)3);gtk_box_pack_start(GTK_BOX(hbox3),button,TRUE,TRUE,5);hbox4 = gtk_hbox_new(FALSE,0);gtk_box_pack_start(GTK_BOX(vbox),hbox4,FALSE,FALSE,5);button = gtk_button_new_with_label("0");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_num_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox4),button,TRUE,TRUE,5);button = gtk_button_new_with_label(".");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_dot_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox4),button,TRUE,TRUE,5);button = gtk_button_new_with_label("=");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_eq_clicked),NULL);gtk_box_pack_start(GTK_BOX(hbox4),button,TRUE,TRUE,5);button = gtk_button_new_with_label("/");g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_suan_clicked),(gpointer)4);gtk_box_pack_start(GTK_BOX(hbox4),button,TRUE,TRUE,5);gtk_widget_show_all(window);gtk_main();return FALSE;
}

编译运行：

-bash-4.1$ gcc -o a calculater.c `pkg-config --cflags --libs gtk+-2.0`
-bash-4.1$ ./a

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GTK实现简单计算器（calculator.c）

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