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#how do I use 'strcat', but in reverse
frail quarryBOT
kind gale
how do I use 'strcat', but in reverse
noble geyser
You need to do it manually.
kind gale
How would I?
mint ginkgo
Hmmm, itoa() is not a standard C library function.
Yet, it's the only function I can find that can convert to other bases.
Having said that, converting to base-26 but only going as far as [0-9] is no different to just converting to base-10 surely?
If you wanted numbers [0-9] to be converted to ['0'-'9'], then just add '0' to i.
kind gale
ive changed to
itoa(int1[i],chara1[i],10);
not sure what you meant about 'then just add '0' to i'
agile sphinx
You can just reverse the chara1 string after for loop and you'll get the same result without worrying about strcat
kind gale
how would i change the end result from
0
10
210
3210
43210
543210
6543210
76543210
876543210
9876543210
to
0
01
012
0123
01234
012345
0123456
01234567
012345678
0123456789
?
agile sphinx
Since you're using non-standard functions, you could use strrev to reverse the string
kind gale
ah i see thanks
frail quarryBOT
@kind gale Has your question been resolved? If so, type !solved :)
kind gale
SHINKU HADOKEN!!!!
the final version:
int int1[10];
char chara1[10][10];
char chara2[10][10];
//int1[0] = 0;
for(i=0;i<10;i++){
int1[i] = i;
itoa(int1[i],chara1[i],10);
strcat(chara1[i],chara1[i-1]);
strcpy(chara2[i],chara1[i]);
strrev(chara2[i]);
printf("%s\n",chara2[i]);
}```
which outputs:
0
01
012
0123
01234
012345
0123456
01234567
012345678
0123456789=]
flint ocean
Your program still contains undefined behavior and is therefore an invalid program as per the C standard.
buoyant gull
not sure what you meant about 'then just add '0' to i'
By adding the character zero, so '0', to an integer i that ranges from 0 to 9, you can easily get the characters '0' to '9'. In this specific case you can just make the for-loop go from the character '0' to '9' directly though, of course, since chars are also just integers.
;compile -Wall -Wextra -Wpedantic -Werror -Wfatal-errors -fsanitize=address,undefined -g
#include <stdio.h>
int main(void) {
for (int i = 0; i < 10; i++) {
putchar(i + '0');
}
putchar('\n');
}
timber chasmBOT
kind gale
;compile -Wall -Wextra -Wpedantic -Werror -Wfatal-errors -fsanitize=address,unde...
that's pretty good
but, the point of my exercise was to assign into arrays =]
mint ginkgo
Okay.
#include <stdio.h>
int main(void) {
char arr[10] = {0};
for (int i = 0; i < 10; i++) {
arr[i] = i + '0';
}
puts(arr);
}
(credit to @buoyant gull )
You should be able to take this snippet and apply it to your program, yes?
kind gale
ye
for (int i = 0; i < 10; i++) {
arr[i] = i + '0';
puts(arr);
}```this is actually the next exercise lol
buoyant gull
Okay.
```c
#include <stdio.h>
int main(void) {
char arr[10] = {0};
for ...
Note that the array should actually be char arr[11] = {0}; if you want to print it with puts()
So do [11] to make space for the null terminator at the end of the string @kind gale
mint ginkgo
True, dat.
Good spot.
buoyant gull
That's why I chose to use putchar(), cause it's just easier
kind gale
So, the function strcat() puts a char behind a string,
Is there a function that puts a char in front of a string
buoyant gull
So, the function strcat() puts a char behind a string,
Is there a function that ...
No, you'll have to implement such a function yourself
Note that strcat puts a string behind another string, not just a char behind a string
buoyant gull
what is ctrcpy and strrev here
strrev() is not part of any C standard, but here's the simple implementation:
https://stackoverflow.com/a/29408476/13279557
;compile -Wall -Wextra -Werror -Wpedantic -Wshadow -Werror -fsanitize=address,undefined -g
#include <stdio.h>
#include <string.h>
char *strrev(char *s) {
if (!s || !*s) {
return s;
}
size_t i = 0;
size_t j = strlen(s) - 1;
while (j > i) {
char c = s[i];
s[i] = s[j];
s[j] = c;
i++;
j--;
}
return s;
}
int main() {
char s1[] = "";
printf("%s\n", strrev(s1));
char s2[] = "a";
printf("%s\n", strrev(s2));
char s3[] = "ab";
printf("%s\n", strrev(s3));
char s4[] = "abc";
printf("%s\n", strrev(s4));
}
!solved
frail quarryBOT