String Common functions

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#include <iostream>#include<string.h>#include<stdlib.h>voidDifferfromstrlenandsizeof (void);voidStringcontact (void);voidStringcompare (void);voidStringcopy (void);voidFormatString (void);voidFindspicified (void);voidSplitstring (void);voidTurninto (void);intMainintargcChar**argv) {        //differfromstrlenandsizeof (); //stringcontact (); //Stringcompare (); //stringcopy (); //formatString (); //splitstring ();Turninto (); return 0;}voidTurninto (void){    //contained within the Stdlib .    intA = Atoi (" at"); printf ("%d\n", a); floatb = Atof ("23.4"); printf ("%f\n", B); LongC =atol ("123456789"); printf ("%d\n", c); }//String SegmentationvoidSplitstring (void){    CharBuf[] ="[email protected] @ghi"; Char*p = Strtok (buf,"@");  while(p) {printf ("%s\n", p); P=strtok (NULL,"@"); }} /** Find the specified element*/voidFindspicified (void){        Chars[Ten]="ABCDEFG"; printf ("%d\n", STRCHR (S,'D'));//the value of the underlying returns 3printf"%d\n", *STRCHR (S,'D')); printf ("%c\n", *STRCHR (S,'D')); printf ("%d\n", STRCHR (S,'P')); printf ("%d\n", Strstr (S,"de")); printf ("%d\n", Strstr (S,"DF")); //not very good (Hui) with             }/** Formatted string*/voidFormatString (void){    //as with printf () basically, just sprintf () This function simply resembles a char[] array to output a string        Charbuf[Ten]; sprintf (BUF,"asdf");//There is an overflow problemsprintf (BUF,"%d",3);//and will also coverprintf (BUF); }/** String Copy*/ voidStringcopy (void){        CharS1[] ="123"; Chars2[Ten];    strcpy (S2,S1);    printf (S2); //try the extra long copy .    Charslong[ -] ="ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss"; //if not wrong, it is because it is not long enough, but as long as this is the hidden danger, hidden danger if not now, sooner or later will be out//so generally look at C write how, put this program continuously open a week, how many times per day how many times of execution, see will crash. //if it's all right, it's basically fine.    If anything, we'll have to look at these places. //for the industry, some programs have been running for more than a year, but the time is a bit longer and may not be possible.         There's going to be a situation like this. //strcpy (S2,slong); //printf (S2); //so in order to avoid this, as prepared, strncpy () string Copy command, need to pass three parameters, copy length. //This will not be tried, but the same requirements. is sizeof (S2)-strlen (S2)-1; "But I always thought it would be better to copy one at the end."strncpy (S2,slong,sizeof(S2)-strlen (S2)-1);    printf (S2); } /** Full comparison of strings strcmp the finite bit comparison of strings strncmp more than one parameter returns the result of the word typeface minus, front-back a-b<0 so return-1, with the corresponding ASCII code. */voidStringcompare (void){    Chars1[]="a"; Chars2[]="b"; printf ("%d\n", strcmp (S1,S2));//-1    CharS3[] ="C"; printf ("%d\n", strcmp (S3,S2));//1printf"%d\n", strcmp (S1,S1));//0printf"%d\n",sizeof(S3));//2        Charss1[]="Lifei1"; Charss2[]="LIFEAA"; printf ("%d\n", strncmp (Ss1,ss2,4));//0printf"%d\n", strncmp (Ss1,ss2,5));//1}/** The value returned by sizeof is found to be 6 digits.    And strlen is 5 numbers. and sizeof feeds back the size of the memory space that this thing opens up, and strlen only returns the part of the pure character. */voidDifferfromstrlenandsizeof (void){    Chars[]="Lifei"; printf ("sizeof (s) is:%d\nstrlen (s) is:%d\n",sizeof(s), strlen (s)); Chars10[Ten]="Comeon"; printf ("sizeof (S10) is:%d\nstrlen (S10) is:%d",sizeof(S10), strlen (S10));}/** Character Append operation*/voidStringcontact (void){    Charsa[Ten] ="123"; CharRb: -] ="ABC";    strcat (SA,SB);    printf (SA); printf ("\ n"); Charsc[]="123456789ddddddddddddddddddddddddddddddddddddddddddddddddd"; //strcat (SA,SC); This is going to be an anomaly .//printf (SA); //strncat (sa,sc,sizeof (SA)-strlen (SA)); The space allocated to the SA for the contents of the space-sa. //There seems to be no error here, but in fact, there is no end to the string because it is not, so it is inherently a false statement but does not cause errors. //strncat (sa,sc,11); Direct error, the reason is: when the stitching is complete, the length of the SA is 17 my operating system is 8-bit. //so at the time of the output address is always 16 0, each one is 16 binary. So I want to add this number first, and then instantly report a forced stop.//strncat (sa,sc,10); it's been in the output, and it scares me. Ctrl + C shut down the program.//strncat (sa,sc,9); and it looks like it's working.//and this result is extremely unstable. There is a certain chance of a mistake. After I have written some notes, the result will not be tried out, but you can then add this number to the top,//The exception will reappear when he is crowding out a memory address that someone else will use, such as adding a 16-bit//Well, I was actually going to say that you should leave it at the end of a character. //sizeof (SA)-strlen (SA)-1, that one 1 is reserved for. Strncat (SA,SC,sizeof(SA)-strlen (SA));    printf (SA); sizeof(SA); printf ("\n%d",sizeof(SA)); //It always feels like there's a problem here because sizeof (SA)-strlen (sa) =4. Actually, we just put 123456789 in SA and there's no problem. //so you shouldn't have put so much data, if you add a limit. I want to know where it's not going to go wrong//not figured out, this number is tried out.          }

String Common functions