C String Function

String.h function supports all the string functions in C.

There are commonly used string functions in C. They are

• strcat(): it concatenates str2 at the end of str1.
• strcmp(): it returns 0 if str1 is same as str2.
• strcpy(): it copies str2 into str1.
• strlen(): it gives the length of str1.
• strncpy(): it copies given the number of characters of one string to another.
• strchr(): it returns the pointer to the first occurence of char in str1.
• strrchr(): The last occurrence of given character in a string is found.
• strstr(): it returns the pointer to the first occurence of str2 in str1.
• strdup(): it duplicates the string.
• strlwr(): it converts the string to lowercase.
• strupr(): it converts the string to uppercase.
• strrev(): it reverses the given string.
• strset(): it sets all character in a string to given character.
• strtok(): it tokenizing given string using the delimiter.

Example:

#include <stdio.h>
#include <string.h>

void main () {
    char str1[30] = "Welcome to";
    char str2[30] = " Onlinetpoint";
    char str3[50];
    /* concatenates str1 and str2 */
    strcat( str1, str2);
	printf("String concatenate str1 & str2:   %s\n", str1 );
    /* copy str1 into str3 */
    strcpy( str3, str1);
    printf("String copy from str1 to str3:   %s\n", str3 );

}