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What does a comma mean inside an 'if' statement?
What does the comma operator , do?comma operator in if conditionWhat are the differences between a pointer variable and a reference variable in C++?What does the explicit keyword mean?What is the “-->” operator in C++?What is the copy-and-swap idiom?What is The Rule of Three?What is the meaning of prepended double colon “::”?What are the basic rules and idioms for operator overloading?C++11 introduced a standardized memory model. What does it mean? And how is it going to affect C++ programming?Why are elementwise additions much faster in separate loops than in a combined loop?Why is my program slow when looping over exactly 8192 elements?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
Consider:
for (auto i = 0; i < g.size(); ++i)
for (auto j = 0; j < g.size(); ++j) if (g[i][j] == 0) dfs(g, i, j), ++regions;
return regions;
I don't like one line code. What does the code execute in the if()?
I am confused by the "," sign.
Usually I would write it as:
for (auto i = 0; i < g.size(); ++i)
improve this question
edited 52 mins ago
Peter Mortensen
14k1987114
asked 3 hours ago
GiladGilad
3,47883991
add a comment |
Consider:
for (auto i = 0; i < g.size(); ++i)
for (auto j = 0; j < g.size(); ++j) if (g[i][j] == 0) dfs(g, i, j), ++regions;
return regions;
I don't like one line code. What does the code execute in the if()?
I am confused by the "," sign.
Usually I would write it as:
for (auto i = 0; i < g.size(); ++i)
improve this question
edited 52 mins ago
Peter Mortensen
14k1987114
asked 3 hours ago
GiladGilad
3,47883991
The second code snippet is not balanced - there are three openings and two closings - it is missing a.
– Peter Mortensen
55 mins ago
See also here: stackoverflow.com/questions/16475032/…
– Valentino
41 mins ago
add a comment |
Consider:
for (auto i = 0; i < g.size(); ++i)
for (auto j = 0; j < g.size(); ++j) if (g[i][j] == 0) dfs(g, i, j), ++regions;
return regions;
I don't like one line code. What does the code execute in the if()?
I am confused by the "," sign.
Usually I would write it as:
for (auto i = 0; i < g.size(); ++i)
improve this question
edited 52 mins ago
Peter Mortensen
14k1987114
asked 3 hours ago
GiladGilad
3,47883991
Consider:
for (auto i = 0; i < g.size(); ++i)
for (auto j = 0; j < g.size(); ++j) if (g[i][j] == 0) dfs(g, i, j), ++regions;
return regions;
I don't like one line code. What does the code execute in the if()?
I am confused by the "," sign.
Usually I would write it as:
for (auto i = 0; i < g.size(); ++i)
improve this question
See also here: stackoverflow.com/questions/16475032/…
– Valentino
41 mins ago
add a comment .
– Peter Mortensen
55 mins ago
See also here: stackoverflow.com/questions/16475032/…
– Valentino
41 mins ago
The second code snippet is not balanced - there are three opening
}.– Peter Mortensen
55 mins ago
The second code snippet is not balanced - there are three opening
}.– Peter Mortensen
55 mins ago
See also here: stackoverflow.com/questions/16475032/…
– Valentino
41 mins ago
See also here: stackoverflow.com/questions/16475032/…
– Valentino
41 mins ago
add a comment |
1 Answer
1
active
oldest
votes
The programmer has used the comma operator to provide two unrelated expressions in a single statement. Because it's a single statement, both expressions are "inside" the if condition.
It's a poor hack, which would be better done with actual braces surrounding two statements.
Your example is not equivalent; it should be:
if (g[i][j] == 0)
dfs(g, i, j);
++regions;
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
3
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
3
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
2
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
3
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
2
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
|
show 12 more comments
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The programmer has used the comma operator to provide two unrelated expressions in a single statement. Because it's a single statement, both expressions are "inside" the if condition.
It's a poor hack, which would be better done with actual braces surrounding two statements.
Your example is not equivalent; it should be:
if (g[i][j] == 0)
dfs(g, i, j);
++regions;
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
3
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
3
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
2
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
3
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
2
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
|
show 12 more comments
The programmer has used the comma operator to provide two unrelated expressions in a single statement. Because it's a single statement, both expressions are "inside" the if condition.
It's a poor hack, which would be better done with actual braces surrounding two statements.
Your example is not equivalent; it should be:
if (g[i][j] == 0)
dfs(g, i, j);
++regions;
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
3
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
3
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
2
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
3
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
2
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
|
show 12 more comments
The programmer has used the comma operator to provide two unrelated expressions in a single statement. Because it's a single statement, both expressions are "inside" the if condition.
It's a poor hack, which would be better done with actual braces surrounding two statements.
Your example is not equivalent; it should be:
if (g[i][j] == 0)
dfs(g, i, j);
++regions;
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
The programmer has used the comma operator to provide two unrelated expressions in a single statement. Because it's a single statement, both expressions are "inside" the if condition.
It's a poor hack, which would be better done with actual braces surrounding two statements.
Your example is not equivalent; it should be:
if (g[i][j] == 0)
dfs(g, i, j);
++regions;
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
answered 3 hours ago
Lightness Races in OrbitLightness Races in Orbit
298k56482828
298k56482828
3
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
3
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
2
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
3
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
2
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
|
show 12 more comments
3
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
3
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
2
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
3
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
2
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
3
3
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
ohh god, why why why would anyone write this code. Thanks
– Gilad
2 hours ago
3
3
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
@Gilad Trying to be clever, most likely! And failing.
– Lightness Races in Orbit
2 hours ago
2
2
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
+1 for the question and +1 for the answer! I didn't even know this was possible, let alone what it meant! Thanks!
– Constantinos Glynos
2 hours ago
3
3
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
@LightnessRacesinOrbit This is a habit of old school programmers due to small monitor resolution (25 rows 80 columns) code was writing as short as possible. More code on one page better readability. Try read modern code on such monitor and you will see how many empty rows in it.
– Andrey Sv
2 hours ago
2
2
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
Of course, that hack is especially useful for macros, which one also should avoid assiduously.
– Deduplicator
2 hours ago
|
show 12 more comments
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The second code snippet is not balanced - there are three opening
s and two closings - it is missing a.– Peter Mortensen
55 mins ago
See also here: stackoverflow.com/questions/16475032/…
– Valentino
41 mins ago