1, code:< br / >空白foo (void) < br / > {< br / >√(4),< br / >} < br /> *****************************************< br / >构建完成了< br /> ***************************************** p > < p > 2,代码:< br / >空白foo (void) < br / > {< br / >双= 0;< br / > sqrt (); < br / >} < br /> *****************************************< br / >构建完成了< br / >***************************************** p > < p > 3,代码:< br / >空白foo (void) < br / > {< br / > aa; < br / > sqrt (); < br / >} < br /> *****************************************< br / >定义引用“√”< br / > collect2.exe:错误:ld返回1退出状态< br / >: * * *(应用程序。精灵]错误1 < br /> ***************************************** p > < p > 4,代码:< br / >空白foo(双x) < br / > {< br / >双= 0;< br / > = x; < br / > sqrt (); < br / >} < br /> *****************************************< br / >定义引用“√”< br / > collect2.exe:错误:ld返回1退出状态< br / >: * * *(应用程序。精灵]错误1 < br /> ***************************************** p > < / div > < / div > < / div > < div class =”字段field-name-field-forum-keywords field-type-taxonomy-term-reference field-label-above”> < div class = "字段标签" >关键词:,< / div > < div class = "字段条目" > < div class =”field-item甚至“> < a href = " / resource-keywords /数学”“=”skos:概念”属性= " rdfs: label skos: prefLabel”数学数据类型= " " > < / > < / div > < / div > < / div > < div class =”字段field-name-field-device field-type-taxonomy-term-reference field-label-above”> < div class = "字段标签" >设备:,< / div > < div class = "字段条目" > < div class =”field-item甚至“> < a href = " / forum-post-device / da1468x typeof =“skos:概念”属性= " rdfs: labelskos: prefLabel”数据类型= " " > DA1468x < / > < / div > < / div > < / div >