There is nothing called string in C, an string in C is a array of chars which is terminated at null ('\0') character like
char name[10] = "QueryHome";
String Declaration Syntax
char variable_name [string_size] ;
String Initialization
a. char name [] = {'Q','u','e','r','y','H','o','m','e','\0'};
b. char name[10] = "QueryHome";
c. char *name = "QueryHome";
Input a String
In C we can input a string using scanf with %s option or gets function.
scanf("%s", variable); // %s in scanf is white character terminated
gets(variable); // terminated at the newline
Output a String
In C we can output a string using printf with %s option or puts function.
printf("%s", variable/string);
puts(string/variable);
String Library Function
Header File: string.h or strings.h
strcpy: copy a string and is used like this: strcpy(destination, source).
strcmp: compare two strings and can be used like this: strcmp(str1, str2).
If the first string is greater than the second string a number greater than null is returned.
If the first string is less than the second string a number less than null is returned.
If the first and the second string are equal a null is returned.
strcat: concatenates a string onto the end of the other string which can be used like this strcat(str1, str2) and returns str1str2
strlen: returns the length of the string and used like this strlen(str);
strstr: Finds the first occurrence of a string (str2 into str1) into other and return the pointer of it else returns null and is used as strstr(str1, str2)
atoi: returns the integer value of a string and used as atoi(String);
