goto

The equivalent of a GOTO in python [duplicate]

由 久未见 提交于 2019-11-26 22:44:44
问题 This question already has an answer here: Is there a label/goto in Python? 17 answers I am self teaching myself python 2.7. I have some experience in using BATCH, which has a GOTO statement. How do I do that in python? For example, suppose I want to jump from line 5 to line 18. I realize there have been previous questions regarding this topic, but I have not found them sufficiently informative or, are too high level in python for my current understanding. 回答1: Goto s are universally reviled

Jump command in MATLAB

由 南楼画角 提交于 2019-11-26 22:26:12
问题 I'm working with the m-file editor of MATLAB and I need to jump from one line to another. If I need to jump from inside a For ... end , I can't use the usual "while" technique. Is there anyway to jump from a line to another, like goto in C? 回答1: There is no goto statement in MATLAB, but there are a few other commands for use with loops that may help you: continue: This statement will skip the remaining commands in a for or while loop and move on to the next iteration. break: This statement

Is there goto statement in Ruby?

由 白昼怎懂夜的黑 提交于 2019-11-26 22:03:09
问题 Is there a way to start at a specified line, like a goto statement? 回答1: First, it would be statement, not a command. Second, see ruby-goto. Third, note Category: Library/Evil 回答2: There is the ruby command line switch -x . -x[directory] Tells Ruby that the script is embedded in a message. Leading garbage will be discarded until the first that starts with “#!” and contains the string, “ruby”. Any meaningful switches on that line will applied. The end of script must be specified with either

C : stack memory, goto and “jump into scope of identifier with variably modified type”,

由 淺唱寂寞╮ 提交于 2019-11-26 22:00:04
问题 I found that this refuses to compile : int test_alloc_stack(int size){ if(0) goto error; // same issue whatever conditional is used int apply[size]; give_values(apply,size); return 1; error: return 0; } The error I get is : "jump into scope of identifier with variably modified type". Eliminating the line with "goto" and the jump to error solves the issues. If I use dynamic allocation for apply, then the problem also disappear. This compiles fine: int test_alloc_heap(int size){ if(0) goto

Is GOTO in PHP evil? [closed]

由 删除回忆录丶 提交于 2019-11-26 20:02:09
I recently found out that PHP 5.3 supports new language construct called GOTO . Everybody knows what it does. However, it's not exactly the traditional GOTO , it's just a jump label. I'm interesting in knowing whether this GOTO is evil and implies bad code? Unless you are programming in assembler, GOTO should always be treated the same way as the life vest of the airplanes: it is good to have them available, but if you need to use them it means that you are in big trouble. Loris I can't believe nobody posted this :) Granted, PHP is not compiled... Maybe the raptor will chase you on every visit

Is it possible to store the address of a label in a variable and use goto to jump to it?

由 家住魔仙堡 提交于 2019-11-26 19:01:34
问题 I know everyone hates gotos. In my code, for reasons I have considered and am comfortable with, they provide an effective solution (ie I'm not looking for "don't do that" as an answer, I understand your reservations, and understand why I am using them anyway). So far they have been fantastic, but I want to expand the functionality in such a way that requires me to essentially be able to store pointers to the labels, then go to them later. If this code worked, it would represent the type of

Is there a goto statement in Java?

由 痞子三分冷 提交于 2019-11-26 18:34:45
问题 I'm confused about this. Most of us have been told that there isn't any goto statement in Java. But I found that it is one of the keywords in Java. Where can it be used? If it can not be used, then why was it included in Java as a keyword? 回答1: The Java keyword list specifies the goto keyword, but it is marked as "not used". It was in the original JVM (see answer by @VitaliiFedorenko), but then removed. It was probably kept as a reserved keyword in case it were to be added to a later version

When implementing an infinite loop, is there a difference in using while(1) vs for(;;) vs goto (in C)?

由 泄露秘密 提交于 2019-11-26 18:17:26
问题 When implementing an infinite loop, is there a difference in using while(1) vs for(;;) vs goto ? Thanks, Chenz 回答1: They are equivalent, even if you turn the optimizer off. Example: #include <stdio.h> extern void f(void) { while(1) { putchar(' '); } } extern void g(void) { for(;;){ putchar(' '); } } extern void h(void) { z: putchar(' '); goto z; } Compile with gcc -O0 gives equivalent assembly for all 3 functions: f: ; [ EXTERNAL ] ; +00000 00000fb4 80402DE9 stmdb sp!,{r7,lr} +00004 00000fb8

Use a 'goto' in a switch?

由 陌路散爱 提交于 2019-11-26 18:15:18
问题 I've seen a suggested coding standard that reads Never use goto unless in a switch statement fall-through . I don't follow. What exactly would this 'exception' case look like, that justifies a goto ? 回答1: This construct is illegal in C#: switch (variable) { case 2: Console.WriteLine("variable is >= 2"); case 1: Console.WriteLine("variable is >= 1"); } In C++, it would run both lines if variable = 2 . It may be intentional but it's too easy to forget break; at the end of the first case label.

Scanf won't execute for second time

由 那年仲夏 提交于 2019-11-26 17:57:49
I am trying:- To re-read the value if user enters an invalid value. But the problem is scanf() executes only once and won't execute any other time and programs gets stuck with an infinite loop. #include<stdio.h> #include<math.h> main() { unsigned int a; unsigned int b = pow(2,M-1); unsigned int c; int x; printf("b = %i",b); input: fflush(stdin); fflush(stdout); printf("\nEnter any integer: "); x = scanf("%u",&a); printf("%u",a); if(x==0) goto input; printf("\na = %i",a); c = a & b; printf("\nc = %i",c); if(c) printf("\nthe bit %i is set",M); else printf("\nthe bit %i is not set",M); } I've
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