How to link the 2 functions
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 '18 at 15:55
Swordfish
9,37811436
asked Nov 22 '18 at 15:49
OofOof
42
add a comment |
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 '18 at 15:55
Swordfish
9,37811436
asked Nov 22 '18 at 15:49
OofOof
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 '18 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 '18 at 15:58
add a comment |
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 '18 at 15:55
Swordfish
9,37811436
asked Nov 22 '18 at 15:49
OofOof
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 '18 at 15:55
Swordfish
9,37811436
asked Nov 22 '18 at 15:49
OofOof
42
edited Nov 22 '18 at 15:55
Swordfish
9,37811436
asked Nov 22 '18 at 15:49
OofOof
42
edited Nov 22 '18 at 15:55
Swordfish
9,37811436
edited Nov 22 '18 at 15:55
Swordfish
9,37811436
edited Nov 22 '18 at 15:55
Swordfish
9,37811436
9,37811436
asked Nov 22 '18 at 15:49
OofOof
42
asked Nov 22 '18 at 15:49
OofOof
42
asked Nov 22 '18 at 15:49
OofOof
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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 at 15:58
add a comment |
1 Answer
1
active
oldest
votes
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 '18 at 16:02
SwordfishSwordfish
9,37811436
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53434463%2fhow-to-link-the-2-functions%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
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 '18 at 16:02
SwordfishSwordfish
9,37811436
add a comment |
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 '18 at 16:02
SwordfishSwordfish
9,37811436
add a comment |
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 '18 at 16:02
SwordfishSwordfish
9,37811436
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 '18 at 16:02
SwordfishSwordfish
9,37811436
edited Nov 22 '18 at 16:30
answered Nov 22 '18 at 16:02
SwordfishSwordfish
9,37811436
answered Nov 22 '18 at 16:02
SwordfishSwordfish
9,37811436
answered Nov 22 '18 at 16:02
SwordfishSwordfish
9,37811436
9,37811436
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53434463%2fhow-to-link-the-2-functions%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
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 '18 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 '18 at 15:58