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Goto Statement in Python
Last updated on 21st Sep 2020, Artciles, Blog, Software Engineering
GOTO is a statement of the early beginnings of programming. It is rarely used in high-level code today.Code that makes use of it is called Spaghetti code by some people. I have almost never seen goto statements in code, so I’ve been curious about them.
Python
Python does NOT offer GOTO. However, somebody made a GOTO module for April Fools’ Day. See goto in Python if you’re still interested.
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Java
Java has no goto statement. Studies illustrated that goto is (mis)used more often than not simply “because it’s there”. Eliminating goto led to a simplification of the language–there are no rules about the effects of a goto into the middle of a for statement, for example. Studies on approximately 100,000 lines of C code determined that roughly 90 percent of the goto statements were used purely to obtain the effect of breaking out of nested loops. As mentioned above, multi-level break and continue remove most of the need for goto statements.
C++
GOTO works in C++. Here is a minimal example:
Minimal Example
- int main(){
- int test = 0;
- start:;
- if (test > 10) {
- goto end;
- } else {
- test += 7;
- goto start;
- }
- end:;
- cout << “test: ” << test << endl;
- return 0;
- output;
- test: 14
- }
Euclidean GCD algorithm
Most of you might know the euclidean algorithm for calculating the greatest common divisor in a version like this one:
- #include <iostream>
- using namespace std;
- int euclidGCD(int a, int b) {
- while (b != 0) {
- int m = a % b;
- a = b;
- b = m;
- }
- return a;
- }
- int main(){
- // Outputs 20
- cout << “GCD of 340 and 32760: ” << euclidGCD(340, 32760) <<endl;
- return 0;
- }
Here is a goto-version that works perfectly fine:
- #include <iostream>
- using namespace std;
- int euclidGCD(int a, int b) {
- if (b > a) goto b_larger;
- while (1) {
- a = a % b;
- if (a == 0) return b;
- b_larger:
- b = b % a;
- if (b == 0) return a;
- }
- }
- int main(){
- cout << “GCD of 340 and 32760: ” << euclidGCD(340, 32760) <<endl;
- return 0;
- }
- #include <iostream>
- using namespace std;
- int myFunction(int i) {
- i += 1;
- inFunctionLabel:;
- i += 1;
- return i;
- }
- int main(){
- int test = 0;
- goto inFunctionLabel;
- cout << “test: ” << test << endl;
- return 0;
- }
Compiler error:
gotoExample.cpp: In function ‘int myFunction(int)’:
gotoExample.cpp:7: warning: label ‘inFunctionLabel’ defined but not used
gotoExample.cpp: In function ‘int main()’:
gotoExample.cpp:15: error: label ‘inFunctionLabel’ used but not defined
So goto is at least bound to its scope.