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String comparision

Posted on 2003-02-21

1 solution

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Last Modified: 2010-04-15

Hello
I am new to c programming. I need to write own code for comparing two strings in C and not use inbuilt strcmp function. Can someone please help me with this.

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Question by:Leafox

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2 Comments

LVL 22

Expert Comment

by:grg99

ID: 79946392003-02-21

Here's a huge hint:

start with i = 0;
compare str1[ i ] with str2[ i ].

if they're both '\0', then the strings are equal, return 0.

if they're not '\0', and equal, move on to the next character (i+1)

now we've found two unequal characters at position i.

if the first one is > the second one, return +1
otherwise return -1.

That's pretty much it.

LVL 1

Accepted Solution

by:codez80

codez80 earned 200 total points

ID: 79959392003-02-21

you can do it like this:

int string_compare(const char* str1, const char* str2)
{
int i;

i = strlen(str1) - strlen(str2);

if (i != 0)
{
return i;
}

while (*str1)
{
i = *str1 - *str2;
if (i != 0)
{
return i;
}
++str1;
++str2;
}

return 0;
}

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