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PREV Write your own .... NEXT   (25 / 301)     Implement the strcmp(str1, str2) function. There are many ways one can implement the strcmp() function. Note that strcmp(str1,str2) returns a -ve number if str1 is alphabetically above str2, 0 if both are equal and +ve if str2 is alphabetically above str1. Here are some C programs which implement the strcmp() function. This is also one of the most frequently asked interview questions. The prototype of strcmp() is int strcmp( const char *string1, const char *string2 ); Here is some C code.. #include <stdio.h> int mystrcmp(const char *s1, const char *s2); int main() {   printf("\nstrcmp() = [%d]\n", mystrcmp("A","A"));   printf("\nstrcmp() = [%d]\n", mystrcmp("A","B"));   printf("\nstrcmp() = [%d]\n", mystrcmp("B","A"));   return(0); } int mystrcmp(const char *s1, const char *s2) {     while (*s1==*s2)     {         if(*s1=='\0')            return(0);         s1++;         s2++;     }     return(*s1-*s2); } And here is the output... strcmp() = [0] strcmp() = [-1] strcmp() = [1] PREV COMMENTS                                  INDEX                                  PRINT NEXT Last updated: November 3, 2005 www.cracktheinterview.com - Your destination for the most common IT interview questions, answers, frequently asked interview questions (FAQ), C Programs, C Datastructures for technical interviews conducted by the top IT companies around the world!