C code for comparing strings

strCmp:  c code for user defined function to compare two strings
//finding a string in strings array
#include<stdio.h>
int strStr(char *str1, char *str2);
int main()
{
char str1[100],str2[10];
printf("Enter few strings:\n");
gets(str1);
printf("Enter the string to search:\n");
gets(str2);

int result;
result=strStr(str1,str2);
if(result==0)
printf("Equals\n");
else
printf("NOT Equals\n");

//return 0;
}

int strStr(char *str1, char *str2)
{
while(*str1==*str2)
{
if(*str1=='\0' || *str2=='\0')
break;

str1++;
str2++;
}

if(*str1=='\0' && *str2=='\0')
return 0;
else
return -1;
}



/*
OUTPUT:
-bash-3.2$ gcc strCmp.c
/tmp/ccyAmuWc.o: In function `main':
strCmp.c:(.text+0x27): warning: the `gets' function is dangerous and should not be used.
-bash-3.2$ ./a.out
Enter few strings:
india
Enter the string to search:
india
Equals
-bash-3.2$ ./a.out
Enter few strings:
india
Enter the string to search:
in
NOT Equals
-bash-3.2$ ./a.out
Enter few strings:
in
Enter the string to search:
india
NOT Equals
-bash-3.2$ india
-bash: india: command not found
-bash-3.2$ ./a.out
Enter few strings:
India
Enter the string to search:
india
NOT Equals
-bash-3.2$

*/
//Alternatestrcmp: string compare -1,0,1

#include<stdio.h>

int strcompare(char *str1, char *str2);

int main()

{

char str1[20];

char str2[20];

printf("Enter String1:\n");

gets(str1);

printf("Enter String1:\n");

gets(str2);

int r;

r=strcompare(str1,str2);

if(r==0)printf("Equal\n");

else if(r>0)printf("Not Equal:%s comes after %s\n",str1,str2);

else printf("Not Equal:%s comes after %s\n",str2,str1);

return 0;

}

int strcompare(char *str1, char *str2)

{

while(((*str1-*str2)==0) && ( (*str1!='\0')|| (*str2!='\0')))

{

str1++;

str2++;

}

printf("*str1=%d,*str2=%d\n",*str1,*str2);

return(*str1-*str2);

}

/*

-bash-3.2$ ./a.out

Enter String1:

ind

Enter String1:

ind

Equal

-bash-3.2$ ./a.out

Enter String1:

ind

Enter String1:

india

Not Equal:india comes after ind

-bash-3.2$ ./a.out

Enter String1:

india

Enter String1:

ind

Not Equal:india comes after ind

-bash-3.2$ ./a.out

Enter String1:

india

Enter String1:

media

Not Equal:media comes after india

-bash-3.2$ ./a.out

Enter String1:

234

Enter String1:

123

Not Equal:234 comes after 123

-bash-3.2$ ./a.out

Enter String1:

india

Enter String1:

India

Not Equal:india comes after India

*/