How to link the 2 functions
up vote
-1
down vote
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What do i need to change that change_sequence_2() is able to get the info from tausche_2()?
void tausche_2 (char *c1, char *c2)
{
char temp;
temp = *c1;
*c1 = *c2;
*c2 = temp;
}
void change_sequence_2(char *F)
{
int i, j;
i = 0;
j = strlen(F) - 1;
while (i < j) {
tausche_2 (F, i, j);
i = i + 1;
j = j - 1;
}
}
c function pointers
edited Nov 22 at 15:55
Swordfish
1
asked Nov 22 at 15:49
Oof
42
add a comment |
up vote
-1
down vote
favorite
What do i need to change that change_sequence_2() is able to get the info from tausche_2()?
void tausche_2 (char *c1, char *c2)
{
char temp;
temp = *c1;
*c1 = *c2;
*c2 = temp;
}
void change_sequence_2(char *F)
{
int i, j;
i = 0;
j = strlen(F) - 1;
while (i < j) {
tausche_2 (F, i, j);
i = i + 1;
j = j - 1;
}
}
c function pointers
edited Nov 22 at 15:55
Swordfish
1
asked Nov 22 at 15:49
Oof
42
tausche_2 only has two parameters, yet you are calling it with 3, also 'i' and 'j' should be '&i' and '&j'.
– SPlatten
Nov 22 at 15:52
Welcome to stackoverflow, please take the tour, then read this: How to Ask and this: Minimal, Complete, and Verifiable example
– Jabberwocky
Nov 22 at 15:58
add a comment |
up vote
-1
down vote
favorite
up vote
-1
down vote
favorite
What do i need to change that change_sequence_2() is able to get the info from tausche_2()?
void tausche_2 (char *c1, char *c2)
{
char temp;
temp = *c1;
*c1 = *c2;
*c2 = temp;
}
void change_sequence_2(char *F)
{
int i, j;
i = 0;
j = strlen(F) - 1;
while (i < j) {
tausche_2 (F, i, j);
i = i + 1;
j = j - 1;
}
}
c function pointers
edited Nov 22 at 15:55
Swordfish
1
asked Nov 22 at 15:49
Oof
42
What do i need to change that change_sequence_2() is able to get the info from tausche_2()?
void tausche_2 (char *c1, char *c2)
{
char temp;
temp = *c1;
*c1 = *c2;
*c2 = temp;
}
void change_sequence_2(char *F)
{
int i, j;
i = 0;
j = strlen(F) - 1;
while (i < j) {
tausche_2 (F, i, j);
i = i + 1;
j = j - 1;
}
}
c function pointers
c function pointers
edited Nov 22 at 15:55
Swordfish
1
asked Nov 22 at 15:49
Oof
42
edited Nov 22 at 15:55
Swordfish
1
asked Nov 22 at 15:49
Oof
42
edited Nov 22 at 15:55
Swordfish
1
edited Nov 22 at 15:55
Swordfish
1
edited Nov 22 at 15:55
Swordfish
1
1
asked Nov 22 at 15:49
Oof
42
asked Nov 22 at 15:49
Oof
42
asked Nov 22 at 15:49
Oof
42
42
tausche_2 only has two parameters, yet you are calling it with 3, also 'i' and 'j' should be '&i' and '&j'.
– SPlatten
Nov 22 at 15:52
Welcome to stackoverflow, please take the tour, then read this: How to Ask and this: Minimal, Complete, and Verifiable example
– Jabberwocky
Nov 22 at 15:58
add a comment |
tausche_2 only has two parameters, yet you are calling it with 3, also 'i' and 'j' should be '&i' and '&j'.
– SPlatten
Nov 22 at 15:52
Welcome to stackoverflow, please take the tour, then read this: How to Ask and this: Minimal, Complete, and Verifiable example
– Jabberwocky
Nov 22 at 15:58
tausche_2 only has two parameters, yet you are calling it with 3, also 'i' and 'j' should be '&i' and '&j'.
– SPlatten
Nov 22 at 15:52
tausche_2 only has two parameters, yet you are calling it with 3, also 'i' and 'j' should be '&i' and '&j'.
– SPlatten
Nov 22 at 15:52
Welcome to stackoverflow, please take the tour, then read this: How to Ask and this: Minimal, Complete, and Verifiable example
– Jabberwocky
Nov 22 at 15:58
Welcome to stackoverflow, please take the tour, then read this: How to Ask and this: Minimal, Complete, and Verifiable example
– Jabberwocky
Nov 22 at 15:58
add a comment |
1 Answer
1
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oldest
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up vote
0
down vote
Since your tausche_2() takes its two parameters as pointers and dereferences them, it operates on the values at the adresses you pass to it. Currently you try to pass 3 parameters with only one of them being a pointer. The right way to call it from change_sequence_2() would be:
tausche_2(&F[i], &F[j]); // I use the address-of operator to make clear for you,
// that this will pass the adresses of the elements at
// position `i` and `j`.
Alternatively you could add the offsets i and j to F:
tausche_2(F + i, F + j); // to get the same addresses.
In tausche_2() the passed pointers get dereferenced with *:
temp = *c1; // assigns temp the value pointed to by c1
*c1 = *c2; // assigns the value pointed to by c1 the value pointed to by c2
*c2 = temp; // assigns the value pointed to by c2 the value of temp
so tausche_2() when called like above effectively operates on the memory pointed to by the parameter char *F of change_sequence_2().
answered Nov 22 at 16:02
Swordfish
1
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
Since your tausche_2() takes its two parameters as pointers and dereferences them, it operates on the values at the adresses you pass to it. Currently you try to pass 3 parameters with only one of them being a pointer. The right way to call it from change_sequence_2() would be:
tausche_2(&F[i], &F[j]); // I use the address-of operator to make clear for you,
// that this will pass the adresses of the elements at
// position `i` and `j`.
Alternatively you could add the offsets i and j to F:
tausche_2(F + i, F + j); // to get the same addresses.
In tausche_2() the passed pointers get dereferenced with *:
temp = *c1; // assigns temp the value pointed to by c1
*c1 = *c2; // assigns the value pointed to by c1 the value pointed to by c2
*c2 = temp; // assigns the value pointed to by c2 the value of temp
so tausche_2() when called like above effectively operates on the memory pointed to by the parameter char *F of change_sequence_2().
answered Nov 22 at 16:02
Swordfish
1
add a comment |
up vote
0
down vote
Since your tausche_2() takes its two parameters as pointers and dereferences them, it operates on the values at the adresses you pass to it. Currently you try to pass 3 parameters with only one of them being a pointer. The right way to call it from change_sequence_2() would be:
tausche_2(&F[i], &F[j]); // I use the address-of operator to make clear for you,
// that this will pass the adresses of the elements at
// position `i` and `j`.
Alternatively you could add the offsets i and j to F:
tausche_2(F + i, F + j); // to get the same addresses.
In tausche_2() the passed pointers get dereferenced with *:
temp = *c1; // assigns temp the value pointed to by c1
*c1 = *c2; // assigns the value pointed to by c1 the value pointed to by c2
*c2 = temp; // assigns the value pointed to by c2 the value of temp
so tausche_2() when called like above effectively operates on the memory pointed to by the parameter char *F of change_sequence_2().
answered Nov 22 at 16:02
Swordfish
1
add a comment |
up vote
0
down vote
up vote
0
down vote
Since your tausche_2() takes its two parameters as pointers and dereferences them, it operates on the values at the adresses you pass to it. Currently you try to pass 3 parameters with only one of them being a pointer. The right way to call it from change_sequence_2() would be:
tausche_2(&F[i], &F[j]); // I use the address-of operator to make clear for you,
// that this will pass the adresses of the elements at
// position `i` and `j`.
Alternatively you could add the offsets i and j to F:
tausche_2(F + i, F + j); // to get the same addresses.
In tausche_2() the passed pointers get dereferenced with *:
temp = *c1; // assigns temp the value pointed to by c1
*c1 = *c2; // assigns the value pointed to by c1 the value pointed to by c2
*c2 = temp; // assigns the value pointed to by c2 the value of temp
so tausche_2() when called like above effectively operates on the memory pointed to by the parameter char *F of change_sequence_2().
answered Nov 22 at 16:02
Swordfish
1
Since your tausche_2() takes its two parameters as pointers and dereferences them, it operates on the values at the adresses you pass to it. Currently you try to pass 3 parameters with only one of them being a pointer. The right way to call it from change_sequence_2() would be:
tausche_2(&F[i], &F[j]); // I use the address-of operator to make clear for you,
// that this will pass the adresses of the elements at
// position `i` and `j`.
Alternatively you could add the offsets i and j to F:
tausche_2(F + i, F + j); // to get the same addresses.
In tausche_2() the passed pointers get dereferenced with *:
temp = *c1; // assigns temp the value pointed to by c1
*c1 = *c2; // assigns the value pointed to by c1 the value pointed to by c2
*c2 = temp; // assigns the value pointed to by c2 the value of temp
so tausche_2() when called like above effectively operates on the memory pointed to by the parameter char *F of change_sequence_2().
answered Nov 22 at 16:02
Swordfish
1
edited Nov 22 at 16:30
answered Nov 22 at 16:02
Swordfish
1
answered Nov 22 at 16:02
Swordfish
1
answered Nov 22 at 16:02
Swordfish
1
1
add a comment |
add a comment |
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tausche_2 only has two parameters, yet you are calling it with 3, also 'i' and 'j' should be '&i' and '&j'.
– SPlatten
Nov 22 at 15:52
Welcome to stackoverflow, please take the tour, then read this: How to Ask and this: Minimal, Complete, and Verifiable example
– Jabberwocky
Nov 22 at 15:58