STANDARAD LIBRARY STRING FUNCTIONS

STANDARD LIBRARY STRING FUNCTIONS:

1)strlen()
2)strcpy()
3)strcat()
4)strcmp()

1)strlen(): which tells about the length of the string means number of characters in that string.it also count the spaces.
Ex: int len1,len2;
len2=strlen("kite fly in sky");
printf("\n string=%s length=%d","kite fly in sky",len2);
output:
string=kite fly in sky=15 // with count of spaces.

2)strcpy(): This function copies the contents of one string into another.
Ex: char source[]="kamesh";
char target[20];
strcpy(target,source);
printf("\nstring=%s",source);
printf("\nstring=%s",target);
output:
source string=kamesh
target string=kamesh

3)strcat(): this function concatenates the source string at the end of the target
string.
For ex: "Ashok" and "varama" on concatenation would result into a string "Ashokvarama".
Ex: char s[]="ashok";
char t[]="varama";
strcat(t,s);
printf("\nstring=%s",t);
output:
sourcestring = Ashokvarama

4)strcmp(): This is a function which compares two strings to find out whether
they are same or different. the two strings are compared character by character until there is a
mismatch or end of one of the strings is reached, whichever occurs first.if the two strings are identical,
strcmp() returns a value zero.if they're not,it returns the numeric
difference between the ascii values of the non-matching characters.
Ex: char s1[]="jerry";
char s2[]="ferry";
int i,j,k;
i=strcmp(s1,"jerry");
j=strcmp(s1,s2);
k=strcmp(s1,"jerry boy");
printf("\n%d%d%d",i,j,k);
output:
0 4 -32