Function string reverse (pointer)-CodePudding

Required to bear on the reverse a string of simple function,

Function interface definition:
Void f (char * p);
Function f to reverse operation of p points to the string, require function f can't define any array, can't call any string handling functions,

The referee sample testing program:
#include
# define MAXS 20

Void f (char * p);
Void ReadString (char * s);/* by the referee, skip some table */

Int main ()
{
Char s [MAXS];

ReadString (s);
F (s);
printf("%s\n", s);

return 0;
}

/* * your code will be embedded in here/
Input the sample:
Hello World!
The output sample:
! DlroW olleH

My code # include & lt; String. H>
Void f (char * p)
{
Int a, b, left, right;
A=strlen (p);
Left=0; Right=a - 1;
While (left{
B=* (p + left); * p=* (p + right); * (p + right)=b;
Left++; Right -;
}
}

CodePudding user response:

B=* (p + left);
* (p + left) =* (p + right);
* (p + right)=b;

CodePudding user response:

While (leftModified into less than or equal to
Solve the odd length error
There are three characters, for example, you try

CodePudding user response:

 # include & lt; stdio.h> 
#include  

# define MAXS 20 

Void f (char * p); 
Void ReadString (char * s);/* by the referee, skip some table */

Int main () 
{
Char s [MAXS]; 

ReadString (s); 
F (s); 
printf("%s\n", s); 

return 0; 
} 

Void ReadString (char * s) 
{
The scanf (" % s ", s); 
} 

Void f (char * p) 
{
Int len, TMP, left, right; 
Len=strlen (p); 
Left=0; 
Right=len - 1; 
While (left{
TMP=* (p + left); 
* (p + left)=* (p + right); 
* (p=TMP + right); 
Left++; 
Right -; 
} 
}

For your reference ~

CodePudding user response:

 
#include  
# define MAXS 20 

Void f (char * p); 
Void ReadString (char * s);/* by the referee, skip some table */

Int main () 
{
Char s [MAXS]; 

ReadString (s); 
F (s); 
printf("%s\n", s); 

return 0; 
} 

Void ReadString (char * s) 
{
char c; 
Char * p; 
P=s; 
While ((c=fgetc (stdin))! EOF)={
If (c=='\ n' | | c=='\ r) {
* p++='\ 0'; 
break; 
} else {
* p++=c; 
} 
} 
} 

Void f (char * p) 
{
Char * head, * tail; 
char c; 

The head=p; 
For (tail=head; * tail!='\ 0'; Tail++) 
; 
Tail -; 

For (; Head & lt; Tail; Head++, tail -) {
C=* head; 
* head=* tail; 
* tail=c; 
} 
}

CodePudding user response:

I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10581430.html
I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10768339.html