Jz-c-42-plus

Sword Point 42nd-Expand: Left rotation string: Left rotation operation is to transfer several characters in front of the string to the end of the string, such as input "ABCDEFG" and the number 2, left rotation 2 bit after: "Cdefgab"

1 //============================================================================2 //Name:jz-c-42-plus.cpp3 //Author:laughing_lz4 //Version:5 //Copyright:all Right Reserved6 //Description: Left rotation string: The left rotation operation is to transfer several characters in front of the string to the end of the string, such as input "ABCDEFG" and the number 2, left rotation 2 bit after: "Cdefgab"7 //============================================================================8 9#include <iostream>Ten#include <stdio.h> One#include"StringUtil.h" A#include <string.h> - using namespacestd; -  the Char* Leftrotatestring (Char* PStr,intN) { -     if(PStr! =NULL) { -         intNlength = static_cast<int>(strlen (PSTR)); -         if(Nlength >0&& n >0&& N <nlength) { +             Char* Pfirststart =pStr; -             Char* Pfirstend = pStr + N-1; +             Char* Psecondstart = pStr +N; A             Char* Psecondend = pStr + nlength-1; at             //flips the front n characters of a string - Reverse (Pfirststart, pfirstend); -             //flips the back part of a string - Reverse (Psecondstart, psecondend); -             //Flip the entire string - Reverse (Pfirststart, psecondend); in         } -     } to  +     returnpStr; - } the  * //==================== test Code ==================== $ voidTest (Char* TestName,Char* Input,intNumChar*Expectedresult) {Panax Notoginseng     if(TestName! =NULL) -printf"%s begins:", testname); the  +     Char* result =leftrotatestring (input, num); A  the     if(Input = = NULL && Expectedresult = =NULL) +|| (Input! = NULL && strcmp (result, expectedresult) = =0)) -printf"passed.\n\n"); $     Else $printf"failed.\n\n"); - } -  the //Functional Testing - voidTest1 () {Wuyi     CharInput[] ="ABCDEFG"; the     CharExpected[] ="Cdefgab"; -  WuTest ("Test1", input,2, expected); - } About  $ //Boundary Value Test - voidTest2 () { -     CharInput[] ="ABCDEFG"; -     CharExpected[] ="BCDEFGA"; A  +Test ("Test2", input,1, expected); the } -  $ //Boundary Value Test the voidTest3 () { the     CharInput[] ="ABCDEFG"; the     CharExpected[] ="Gabcdef"; the  -Test ("Test3", input,6, expected); in } the  the //Robustness Testing About voidTest4 () { theTest ("Test4"Null6, NULL); the } the  + //Robustness Testing - voidTest5 () { the     CharInput[] ="ABCDEFG";Bayi     CharExpected[] ="ABCDEFG"; the  theTest ("Test5", input,0, expected); - } -  the //Robustness Testing the voidTest6 () { the     CharInput[] ="ABCDEFG"; the     CharExpected[] ="ABCDEFG"; -  theTest ("Test6", input,7, expected); the } the 94 intMainintargcChar**argv) { the Test1 (); the Test2 (); the Test3 ();98 Test4 (); About Test5 (); - Test6 ();101 102     return 0;103}

Jz-c-42-plus