strcmp() string function for case sensitive string comparison in C program

We can compare stings by using strcmp() string function.

strcmp(string1, string2);

string1, string2 : Two Input strings for camparison.
Output

0 : If both strings are equal.
1 ( or greater than 1 ) : If length of string1 > length of string2 .
-1 ( or less than -1 ) : If length of string1 < length of string2 .

We will use this and here is one example.

#include <stdio.h>
#include <string.h>
int main(void){
   char str1[]="plus2";
   char str2[]="plus2net";
   char str3[]="plus2net";
   int x,y,z;
   x=strcmp(str1,str2);
   y=strcmp(str2,str1);
   z=strcmp(str2,str3);
   printf("Output: %d , %d,%d",x,y,z);
   return 0;
}

The output of above code is here

-1,1,0

x =-1 because length of str1 is less than length of str2.
y = 1 because length of str2 is greater than length of str1.
z = 0 because length of str2 is equal to length of str3.

strcmp() is case sensitive string comparison so the output of below code is 1 ( not 0 )

#include <stdio.h>
#include <string.h>
int main(void){
   char str2[]="plus2net";
   char str3[]="Plus2net"; // Watch the first char P 
   int z;
   z=strcmp(str2,str3);
   printf("Output: %d",z);
   return 0;
}

Output

If the string matches then you will get 0 as output , but if strings are not matching you may get more than 1 or less than -1 as output ( based on difference in string1 and string2 ) depending upon your Operating system.

Example : In place of -1 , you may get -32 or in place of +1 , you may get 55

String Functions Scripts strcmpi() C- Tutorials

strcmp(): string comparison