意思是 这个switch语句无法跳转到某个case语句进行判断。原因是你的case 'j'里定义了变量,但没有用花括号括起来。把case 'j'改成这样就可以了:case 'j':printf("请输入整数n:\n");{ int c,sum=1;scanf("%d",&c);for(int i=a;i>1;i--){ sum*=i;} printf("%d!=%d",c,sum)...
case_init.cpp:9: error: jump to case label case_init.cpp:7: error: crosses initialization of `int a' 首先在这里作者提到问题出在本地(local)变量或者叫做自动变量的作用域范围,点的很好。本地变量的作用域仅在花括号之间。于是方案1: 代码: switch (t) { case 0: { //added for fix problem in...
归根到底,出现上述的crosses initialization和jump to case label错误的原因是由于变量的作用域问题,因此一个好的习惯就是在case子句下面加上大括号来限定变量的作用域。 switch(a) { case 0: {int b=1;cout<<b<<endl;break;} case 1: break; default: break; } 1. 2. 3. 4. 5. 6. 不过要注意,一...
归根到底,出现上述的crosses initialization和jump to case label错误的原因是由于变量的作用域问题,因此一个好的习惯就是在case子句下面加上大括号来限定变量的作用域。 switch(a) {case0: {intb=1;cout<<b<<endl;break;}case1:break;default:break; } 不过要注意,一旦加上了大括号,在case 0后面便不能访问...
switch(foo) { case 1: int i = 42; // i exists all the way to the end of the switch dostuff(i); break; case 2: dostuff(i*2); // i is *also* in scope here, but is not initialized! } 3.7(10 Votes) Are there any code examples left?
case 0x80: 冒号后面 你没写语句,也没有分号。pResult是一个char型指针, 你是怎样声明的,给了什么值? 程序写对了就好了。程序例子:include<stdio.h> int main(){ char *pResult="abcd";switch( *(pResult+2)){ case 0x80: printf("0x80");break;default: printf("abcd");} retur...
prog.c: In function ‘main’: prog.c:9:6: error: case label not within a switch statement case 1: ^~~~ prog.c:11:10: error: break statement not within loop or switch break; ^~~~ prog.c:12:6: error: case label not within a switch statement case 2: ^~~~ prog.c:14:10: ...
default语句那行:error: cannot jump from switch statement to this case label 原因:case语句里面不能定义对象,如果case语句中出现两条及以上(不含break)的语句,就要用大括号{}将语句包含,在花括号 “{ }”中定义的对象,那么该对象的作用域就局限在这对花括号里。
Represents a switch label within a switch statement.C# Copy public abstract class SwitchLabelSyntax : Microsoft.CodeAnalysis.CSharp.CSharpSyntaxNodeInheritance Object SyntaxNode CSharpSyntaxNode SwitchLabelSyntax Derived Microsoft.CodeAnalysis.CSharp.Syntax.CasePatternSwitchLabelSyntax Microsoft.CodeAnalysis.C...
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