Find String length and Arraysearch
Hello,
I am wondering whether anybody could help me or point me in the right direction for this problem. Please find the problem and the solution i have written. I would like to know whether this can be improved in any way or any other alternative solution. I tried my level best to follow the guidelines. If i have not please accept my apologies as it is my very first post in this forum.
The problem is :
Code:
Do not make use of third party or non standard language libraries.
Declare any dependencies on standard language libraries.
Array Search C
Write a function, arraysearch, that searches through a sorted array of C strings for a specified string, using the following function definition:
int searcharray(char ** array, int arraySize, char * searchString);
The function should return the 1-based index of the matching element in the array, or the value 0 if the search string cannot be found.
The parameters are as follows:
Parameter Description
array Sorted array of C strings
arraySize Number of elements in the array
searchString C string being searched
Assumptions/Constraints:
The strings in the array are sorted in ASCII alphabetical order.
The array and each of the elements of the array between 0 and arraySize-1 are valid pointers.
The array may potentially contain a large number of elements, and the function should be optimized for speed.
The array will not contain any duplicate elements.
Examples:
char * array[5] = { "abc" "efg", "ijk", "lmno", "pqrs" };
searcharray(array, 5, "abc") returns 1
searcharray(array, 5, "six") returns 0
String Compare C
Write a function, strspcmp, that compares two C strings ignoring any trailing spaces, using the following function definition:
int strspcmp(const char * s1, const char * s2);
The function should return an integer value according to the following table:
Case Return Value
String s1 is less than s2 -1
String s1 is equal to s2 0
String s1 is greater than s2 1
Assumptions/Constraints:
You may not use a regular expression library.
Do not use string function from C standard library.
Examples:
mystrcmp( "Hello", "Hello" ) returns 0
mystrcmp( "Hello", "World" ) returns -1
mystrcmp( "World", "Hello" ) returns 1
And the solution is
Code:
int arraysearch(char** my_array, int array_size, char* search_string)
{
int start_pos = 0, end_pos = 0, curr_pos = 0, iterations = 1, prev_curr_pos = 0;
end_pos = array_size;
while (1)
{
curr_pos = (end_pos - start_pos) / 2 + start_pos;
if (prev_curr_pos == curr_pos)
{
return 0;
break;
}
prev_curr_pos = curr_pos;
if (strspcmp(search_string,my_array[curr_pos]) == 0)
{
return (curr_pos + 1);
break;
}
else if (strspcmp(search_string,my_array[curr_pos]) > 0)
{
start_pos = curr_pos + 1;
}
else
{
end_pos = curr_pos - 1;
}
}
}
int mystrlen(const char* s1)
{
int i;
for (i=0;s1[i] != '\0';i++);
return i;
}
int strspcmp(const char* s1, const char* s2)
{
int source_string_length = 0;
int loop_counter = 0;
int target_string_length = 0;
if ((s1 == NULL) || (s2 == NULL))
{
printf("Invalid string supplied");
return -999;
}
source_string_length = mystrlen(s1);
target_string_length = mystrlen(s2);
for(loop_counter=0;s1[loop_counter] == s2[loop_counter] && loop_counter < source_string_length;loop_counter ++);
if (loop_counter == target_string_length && loop_counter == source_string_length)
{
return 0;
}
else
{
if (s1[loop_counter] > s2[loop_counter])
{
return 1;
}
else
{
return -1;
}
}
}
Once again thank you very much for you help in advance
Regards
Raj
