为什么我在DevC ++中将i2的输出变为1,而在其他地方我得到0?
#include <stdio.h>
int main(void) {
int i1,i2;
char c1,c2;
float f1,f2;
long l1,l2;
double d1,d2;
printf("\n%d %d",i1,i2);
printf("\n%c %c",c1,c2);
printf("\n%d %d",f1,f2);
printf("\n%l %l",l1,l2);
printf("\n%lf %lf",d1,d2);
return 0;
}
答案 0 :(得分:2)
在打印时,您没有初始化导致Undefined behavior的任何变量。请注意,当您声明
时 //Principal panel
private class PanelPrincipalAnexo extends WebMarkupContainer
{
public PanelPrincipalAnexo(String id)
{
super(id);
formUpload = getFormUpload();
add(formUpload);
formUpload.add(getDataViewAnexos("anexos"));
}
}
//creating the FormUpload
private FileUploadForm getFormUpload() {
return new FileUploadForm("formUpload", new PropertyModel<List<FileUpload>>(this, "uploads"));
}
private DataView<ProgramaAnexo> getDataViewAnexos(String id) {
return new DataView<ProgramaAnexo>(id, new AnexoProvider()) {
private static final long serialVersionUID = 1L;
@Override
protected void populateItem(Item<ProgramaAnexo> item) {
item.add(new Label("tipoArquivo"));
item.add(new Label("nomeAnexo"));
item.add(new Label("tamanhoArquivoEmMB"));
item.add(getButtonRemove(item));
}
};
}
public AjaxSubmitLink getButtonRemove(Item<ProgramaAnexo> item) {
AjaxSubmitLink button = new AjaxSubmitLink("btnRemoverBem", form) {
private static final long serialVersionUID = 1L;
@Override
public void onSubmit(AjaxRequestTarget target, Form form) {
actionRemoverKit(target,item);
}
};
return button;
}
private void actionRemoverKit(AjaxRequestTarget target,Item<ProgramaAnexo> item) {
ProgramaAnexo bemRemove=item.getModelObject();
int cont=0;
for(ProgramaAnexo bem:list)
{
if(bemRemove.getBem().getId().intValue()==bem.getBem().getId().intValue())
{
listaBensSelecionadosDireito.remove(cont);
break;
}
}
target.add(panelPrincipalAnexo);
}
THE HTML
<table width="98%" class="table table-hover"
style="table-layout: fixed;">
<thead>
<tr>
<th width="16%"></th>
<th width="16%">Tipo</th>
<th width="29%">Arquivo</th>
<th width="10%">Tamanho</th>
<th width="25%" class="text-left">Ações</th>
<th width="4%"></th>
</tr>
</thead>
<tbody>
<tr wicket:id="anexos">
<td width="16%"></td>
<td width="16%"><span wicket:id="tipoArquivo"></span></td>
<td width="29%"><span wicket:id="nomeAnexo"></span></td>
<td width="10%"><span wicket:id="tamanhoArquivoEmMB"></span></td>
<td width="25%" class="text-left">
<button wicket:id="btnExcluirAnexo"
title="Excluir"
class="btn btn-danger btn-sm"
id="btnRemoverBem"">
<i class="fa fa-minus"></i>
</button>
</td>
<td width="4%"></td>
</tr>
</tbody>
</table>
并保持未初始化状态,它们包含垃圾值。
答案 1 :(得分:2)
尚未初始化或分配值的自动对象具有不确定的值,即未指定的值或陷阱表示。