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Rework the arrays and strings guide for C (#29444)

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* Use code blocks instead of plain text

* Fix manual implementation of strlen

* Fix array-declaration in code snippets
This commit is contained in:
philippG777
2018-12-26 19:00:19 +01:00
committed by Christopher McCormack
parent fce3fefc09
commit 514409badf
1 changed files with 9 additions and 11 deletions
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20
guide/english/c/arrays-and-strings/index.md
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@ -21,9 +21,9 @@ Notice that in this example, we didn't bother specifying a number in the square
When initializing an array, you can provide fewer values than array elements. For example, the When initializing an array, you can provide fewer values than array elements. For example, the
following statement initializes only the first two elements of my_array: following statement initializes only the first two elements of my_array:
```C
float my_array[5] = {5.0, 2.5}; float my_array[5] = {5.0, 2.5};
```
If you partially initialize an array, the compiler sets the remaining elements to zero. If you partially initialize an array, the compiler sets the remaining elements to zero.
Now that the array has been declared with 5 values, it has 5 memory locations. Consider this table for a visual example of that: Now that the array has been declared with 5 values, it has 5 memory locations. Consider this table for a visual example of that:
@ -142,7 +142,8 @@ strcpy(first, second);
``` ```
Here is an example of how manual implementation of the strcpy function looks like: Here is an example of how manual implementation of the strcpy function looks like:
```C ```C
void copy_string(char [] first_string, char [] second_string)
void copy_string(char first_string [], char second_string [])
{ {
int i; int i;
for(i = 0; second_string[i] != '\0'; i++) for(i = 0; second_string[i] != '\0'; i++)
@ -166,11 +167,9 @@ Note: both `strcpy` and `strncpy` make sure that the copied string ends in a nul
strcat(first, second); strcat(first, second);
``` ```
Here is an example of manual implementation of function `strcat`: Here is an example of manual implementation of function strcat:
```C ```C
void string_concatenate(char s1 [], char s2 [])
```C
void string_concatenate(char [] s1, char [] s2)
{ {
int i = strlen(s1), j; int i = strlen(s1), j;
for(j = 0; s2[j]; j++, i += 1) for(j = 0; s2[j]; j++, i += 1)
@ -194,14 +193,13 @@ strncat(char s1[], char s2[], int n);
string_length = strlen(my_string); string_length = strlen(my_string);
``` ```
Here is a manual implementation of function strlen: Here is an manual implementation of fuction strlen:
```C ```C
int string_length(char [] string) int string_length(char string [])
{ {
int i; int i;
for(i = 0; string[i]; i++); for(i = 0; string[i] != '\0'; i++);
return i; return i;
} }