Pointers in the functions does not return the proper values
0
So I have a code sample in Dev C++ in which I am trying to swap the values of s1 and s2 and print it out but somehow, the values doesn't change. I checked the function and it displays the proper values correctly, but when in the main, the values does not change.
void swap_pointers(char *x,char *y){
char *tmp;
tmp = x;
x = y;
y = tmp;
printf("%sn",x);
printf("%snn",y);
}
int main()
{
char *s1, *s2;
s1 = "I should print second";
s2 = "I should print first";
swap_pointers(s1,s2);
printf("-AFTER SWAPPING-nn");
printf("s1 is %sn",s1);
printf("s2 is %sn",s2);
return 0;
}
function pointers dev-c++
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
|
show 1 more comment
0
So I have a code sample in Dev C++ in which I am trying to swap the values of s1 and s2 and print it out but somehow, the values doesn't change. I checked the function and it displays the proper values correctly, but when in the main, the values does not change.
void swap_pointers(char *x,char *y){
char *tmp;
tmp = x;
x = y;
y = tmp;
printf("%sn",x);
printf("%snn",y);
}
int main()
{
char *s1, *s2;
s1 = "I should print second";
s2 = "I should print first";
swap_pointers(s1,s2);
printf("-AFTER SWAPPING-nn");
printf("s1 is %sn",s1);
printf("s2 is %sn",s2);
return 0;
}
function pointers dev-c++
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
In C arguments are passed by value, meaning they are copied. Inside a function, all you have is the copies. Modifying a copy will not modify the original. To solve it I recommend that you do some research about emulating pass by reference in C.
– Some programmer dude
Nov 21 '18 at 8:47
Oh, is the code you're writing really C++? Or is it C? The only C++ specific bit is the lack ofvoidas argument to themainfunction. If this is really C++, then the natural solution is to usestd::swapinstead of making your own. Or if you do it for educational reasons then read about references (which C doesn't have).
– Some programmer dude
Nov 21 '18 at 9:01
You have websites where I can start atleast so I can solve this further? I just want my program to work so I can try to learn from those mistakes.
– Abraham
Nov 21 '18 at 9:23
First of all, asking for links is not on topic. Secondly, we could not have provided proper links anyway since we don't know if you're programming in C or C++ (thedev-c++tag is for the development environment, not the language). Lastly, use your favorite search engine, it should be very good at finding websites.
– Some programmer dude
Nov 21 '18 at 9:26
I don't know if Dev C++ has a syntax of its own but I can say I'm programming in C++ platform.
– Abraham
Nov 21 '18 at 9:28
|
show 1 more comment
0
0
0
So I have a code sample in Dev C++ in which I am trying to swap the values of s1 and s2 and print it out but somehow, the values doesn't change. I checked the function and it displays the proper values correctly, but when in the main, the values does not change.
void swap_pointers(char *x,char *y){
char *tmp;
tmp = x;
x = y;
y = tmp;
printf("%sn",x);
printf("%snn",y);
}
int main()
{
char *s1, *s2;
s1 = "I should print second";
s2 = "I should print first";
swap_pointers(s1,s2);
printf("-AFTER SWAPPING-nn");
printf("s1 is %sn",s1);
printf("s2 is %sn",s2);
return 0;
}
function pointers dev-c++
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
So I have a code sample in Dev C++ in which I am trying to swap the values of s1 and s2 and print it out but somehow, the values doesn't change. I checked the function and it displays the proper values correctly, but when in the main, the values does not change.
void swap_pointers(char *x,char *y){
char *tmp;
tmp = x;
x = y;
y = tmp;
printf("%sn",x);
printf("%snn",y);
}
int main()
{
char *s1, *s2;
s1 = "I should print second";
s2 = "I should print first";
swap_pointers(s1,s2);
printf("-AFTER SWAPPING-nn");
printf("s1 is %sn",s1);
printf("s2 is %sn",s2);
return 0;
}
function pointers dev-c++
function pointers dev-c++
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
asked Nov 21 '18 at 8:46
AbrahamAbraham
44
44
In C arguments are passed by value, meaning they are copied. Inside a function, all you have is the copies. Modifying a copy will not modify the original. To solve it I recommend that you do some research about emulating pass by reference in C.
– Some programmer dude
Nov 21 '18 at 8:47
Oh, is the code you're writing really C++? Or is it C? The only C++ specific bit is the lack ofvoidas argument to themainfunction. If this is really C++, then the natural solution is to usestd::swapinstead of making your own. Or if you do it for educational reasons then read about references (which C doesn't have).
– Some programmer dude
Nov 21 '18 at 9:01
You have websites where I can start atleast so I can solve this further? I just want my program to work so I can try to learn from those mistakes.
– Abraham
Nov 21 '18 at 9:23
First of all, asking for links is not on topic. Secondly, we could not have provided proper links anyway since we don't know if you're programming in C or C++ (thedev-c++tag is for the development environment, not the language). Lastly, use your favorite search engine, it should be very good at finding websites.
– Some programmer dude
Nov 21 '18 at 9:26
I don't know if Dev C++ has a syntax of its own but I can say I'm programming in C++ platform.
– Abraham
Nov 21 '18 at 9:28
|
show 1 more comment
In C arguments are passed by value, meaning they are copied. Inside a function, all you have is the copies. Modifying a copy will not modify the original. To solve it I recommend that you do some research about emulating pass by reference in C.
– Some programmer dude
Nov 21 '18 at 8:47
Oh, is the code you're writing really C++? Or is it C? The only C++ specific bit is the lack ofvoidas argument to themainfunction. If this is really C++, then the natural solution is to usestd::swapinstead of making your own. Or if you do it for educational reasons then read about references (which C doesn't have).
– Some programmer dude
Nov 21 '18 at 9:01
You have websites where I can start atleast so I can solve this further? I just want my program to work so I can try to learn from those mistakes.
– Abraham
Nov 21 '18 at 9:23
First of all, asking for links is not on topic. Secondly, we could not have provided proper links anyway since we don't know if you're programming in C or C++ (thedev-c++tag is for the development environment, not the language). Lastly, use your favorite search engine, it should be very good at finding websites.
– Some programmer dude
Nov 21 '18 at 9:26
I don't know if Dev C++ has a syntax of its own but I can say I'm programming in C++ platform.
– Abraham
Nov 21 '18 at 9:28
In C arguments are passed by value, meaning they are copied. Inside a function, all you have is the copies. Modifying a copy will not modify the original. To solve it I recommend that you do some research about emulating pass by reference in C.
– Some programmer dude
Nov 21 '18 at 8:47
In C arguments are passed by value, meaning they are copied. Inside a function, all you have is the copies. Modifying a copy will not modify the original. To solve it I recommend that you do some research about emulating pass by reference in C.
– Some programmer dude
Nov 21 '18 at 8:47
Oh, is the code you're writing really C++? Or is it C? The only C++ specific bit is the lack of
void as argument to the main function. If this is really C++, then the natural solution is to use std::swap instead of making your own. Or if you do it for educational reasons then read about references (which C doesn't have).– Some programmer dude
Nov 21 '18 at 9:01
Oh, is the code you're writing really C++? Or is it C? The only C++ specific bit is the lack of
void as argument to the main function. If this is really C++, then the natural solution is to use std::swap instead of making your own. Or if you do it for educational reasons then read about references (which C doesn't have).– Some programmer dude
Nov 21 '18 at 9:01
You have websites where I can start atleast so I can solve this further? I just want my program to work so I can try to learn from those mistakes.
– Abraham
Nov 21 '18 at 9:23
You have websites where I can start atleast so I can solve this further? I just want my program to work so I can try to learn from those mistakes.
– Abraham
Nov 21 '18 at 9:23
First of all, asking for links is not on topic. Secondly, we could not have provided proper links anyway since we don't know if you're programming in C or C++ (the
dev-c++ tag is for the development environment, not the language). Lastly, use your favorite search engine, it should be very good at finding websites.– Some programmer dude
Nov 21 '18 at 9:26
First of all, asking for links is not on topic. Secondly, we could not have provided proper links anyway since we don't know if you're programming in C or C++ (the
dev-c++ tag is for the development environment, not the language). Lastly, use your favorite search engine, it should be very good at finding websites.– Some programmer dude
Nov 21 '18 at 9:26
I don't know if Dev C++ has a syntax of its own but I can say I'm programming in C++ platform.
– Abraham
Nov 21 '18 at 9:28
I don't know if Dev C++ has a syntax of its own but I can say I'm programming in C++ platform.
– Abraham
Nov 21 '18 at 9:28
|
show 1 more comment
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In C arguments are passed by value, meaning they are copied. Inside a function, all you have is the copies. Modifying a copy will not modify the original. To solve it I recommend that you do some research about emulating pass by reference in C.
– Some programmer dude
Nov 21 '18 at 8:47
Oh, is the code you're writing really C++? Or is it C? The only C++ specific bit is the lack of
voidas argument to themainfunction. If this is really C++, then the natural solution is to usestd::swapinstead of making your own. Or if you do it for educational reasons then read about references (which C doesn't have).– Some programmer dude
Nov 21 '18 at 9:01
You have websites where I can start atleast so I can solve this further? I just want my program to work so I can try to learn from those mistakes.
– Abraham
Nov 21 '18 at 9:23
First of all, asking for links is not on topic. Secondly, we could not have provided proper links anyway since we don't know if you're programming in C or C++ (the
dev-c++tag is for the development environment, not the language). Lastly, use your favorite search engine, it should be very good at finding websites.– Some programmer dude
Nov 21 '18 at 9:26
I don't know if Dev C++ has a syntax of its own but I can say I'm programming in C++ platform.
– Abraham
Nov 21 '18 at 9:28