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Write the following function in C.
stripos — Find position of first occurrence of a case-
insensitive string
int stripos ( char* haystack, char* needle, int offset )
Returns the numeric position of the first occurrence of
needle in the
haystack string. Note that the needle may be a string of
one or more
characters. If needle is not found, stripos() will return -
1.
The function should not make use of any C library function
calls.
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Answer Posted / vadivelt
#include<stdio.h>
int stripos(char* haystack, char* needle, int offset );
void main()
{
char a1[200], a2[20];
int iPostn = 0;
printf("ENTER THE HAYSTACK STRING:\n");
gets(a1);
printf("\nENTER THE STRING - TO BE SEARCHED\n");
gets(a2);
iPostn = stripos(&a1[0], &a2[0], iPostn);
if(iPostn > 0)
printf("\nSTRING STARTS AT THE POSITION: %d\n", iPostn);
else
printf("\nSTRING NOT FOUND: %d\n", iPostn);
getch();
}
int stripos(char* haystack, char* needle, int offset )
{
char ch, *needle1;
int pos = 0, temp;
if(haystack != '\0' && needle != '\0')
{
while(*haystack != '\0')
{
needle1 = needle;
pos++;
temp = 0;
if((*haystack == *needle1) || (*haystack == *needle1 - 32)
|| (*haystack == *needle1 + 32))
{
offset = pos;
needle1++;
haystack++;
while(*needle1 != '\0')
{
if((*haystack == *needle1) || (*haystack ==
*needle1 - 32) || (*haystack == *needle1 + 32))
{
haystack++;
needle1++;
pos++;
}
else
{
temp = 1;
offset = -1;
break;
}
}
}
if(offset > 0)
{
return offset;
}
if(temp != 1)
haystack++;
}
}
return offset;
}
| Is This Answer Correct ? | 13 Yes | 4 No |
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