Summary of string correlation functions

Char class:

1.strcpy (S1,S2); Copy the String S2 as the starting address into S2.

2.strncpy (s1,s2,k); copies the first k of the string S2 as the starting address into S1.

Char s1[],s2[];cin>>S2; int k=4; strncpy (s1,s2,k); S1[k]='n'; cout <<s1<<endl;

3.strstr (S1,S2); finds S2 in S1, returns the first occurrence if found, otherwise returns NULL.

Char s1[]={"ABC"},s2[]={"iiiabciii"}; Char* pos=strstr (S2,S1); if (pos!=null) printf ("%s\n", POS); // Output: ABCIII

4.STRCMP (S1,S2); Compares the size of S1 and S2 by dictionary order. The equivalent return 0;S1>S2 returns 1;S1<S2 returns-1.

5.STRNCMP (s1,s2,n); the STRNCMP function specifies the comparison of size characters. That is, if the string S1 is the same as the first size character of S2, the function returns a value of 0.

Char s1[]={"ABCDD"}; Char s2[]={"ABC"};p rintf ("%d\n", STRNCMP (S1,S2,3));

String class:

1. STRING.C_STR ();

The const char* type is returned;

string s;cin>>s; Const Char* str=s.c_str ();p UTS (str);

Summary of string correlation functions