C + + Common string processing functions and usage examples

Char *strcpy (char *s1, const char *S2)

Copies the string s2 to the string array S1, returning the value of S1

Char *strncpy (char *s1, const char *S2, size_t N)

Copies the maximum n characters in the string S2 to the string array S1, returning the value of S1

Char *strcat (char *s1, const char *S2)

Adds a string S2 to the back of the string S1. S2 The first character of the S1 to redefine the null terminator. Returns the value of the S1

Char *strncat (char *s1, const char *S2, size_t N)

Adds up to n characters in the string S2 to the back of the string S1. S2 The first character of the S1 to redefine the null terminator. Returns the value of the S1

int strcmp (const char *S1, const char *S2)

Compares string s1 and string s2. function returns a value of 0, less than 0, or greater than 0 when S1 equals, less than, or greater than S2

int strncmp (const char *S1, const char *S2, size_t N)

Compares n characters and string S2 in a string S1. function returns a value of 0, less than 0, or greater than 0 when S1 equals, less than, or greater than S2

char * strtok (char *s1,const char *s2)

The S1 string is marked with a series of strtok calls (dividing the string into logical components, like each word in a line of text), separated by the characters contained in the string S2. The first invocation contains S1 as the first argument, which continues to mark the same string when called, and contains null as the first argument. Returns the current tag pointer each time it is invoked. Returns NULL if the function call no longer has more tags

size_t strlen (const char *s)

Determines the length of the string, returning the number of characters before the null terminator

Use examples:

Source code compiled in visual c++6.0 environment
#include <iostream.h>
#include <string.h>
int main ()
{
Char str1[50] = "Happy birthday to", str2[] = "Coffeehu";
Char temp1[100],temp2[6], * temp;
Char str[] = "This is a sentence with 7 tokens";
strcpy (Temp1, str1);
strncpy (Temp2, STR1, 5);
TEMP2[5] = ' the ';
cout << "strcpy result:" <<temp1 << "\ n";
cout << "strncpy result:" << temp2 << "\ n";
cout << "strcat result:" << strcat (str1, str2) << "\ n";
cout << "strncat result:" << strncat (str1, str2, 6) << "\ n";
cout << "strcmp result:" << strcmp (Temp2, "Happ") << "\ n";
cout << "strncmp result:" << strncmp (str1, "Happy", 5) << "\ n";
strtok function eg.
temp = strtok (str, "");
while (temp!= NULL)
{
cout << temp << ' \ n ';
temp = Strtok (NULL, "");
}
cout << "strlen result:" << strlen (str2) << "\ n";
return 0;
}