Conversion of strings and 16 binary strings

In our work, we sometimes need to convert a string into a 16 string to the user, because there are some characters in ASCII, when we use printf ("%s", p_ch), the output will be messy, and if you use 16, it will be much better.

So write the program with the following code:

#include <stdio.h>#include<string.h>intStrtohex (Char*ch,Char*hex);intHEXTOSTR (Char*hex,Char*ch);intHexchartovalue (Const Charch);CharValuetohexch (Const intvalue);intMainintargcChar*argv[]) {    Charch[1024x768]; Charhex[1024x768]; Charresult[1024x768]; Char*p_ch =ch; Char*p_hex =Hex; Char*p_result =result; printf ("Please input the string:"); scanf ("%s", p_ch);    Strtohex (P_ch,p_hex); printf ("The hex is:%s\n", P_hex);    Hextostr (P_hex, P_result); printf ("The string is:%s\n", P_result); return 0;}intStrtohex (Char*ch,Char*hex) {  intHigh,low; intTMP =0; if(ch = = NULL | | hex = =NULL) {    return-1; }  if(strlen (ch) = =0){    return-2; }   while(*ch) {tmp= (int)*ch; High= tmp >>4; Low= tmp & the; *hex++ = Valuetohexch (high);//write high byte first*hex++ = Valuetohexch (low);//Next Write Low bytech++; }  *hex =' /'; return 0;}intHEXTOSTR (Char*hex,Char*ch) {  intHigh,low; intTMP =0; if(hex = = NULL | | ch = =NULL) {    return-1; }  if(strlen (hex)%2==1){    return-2; }   while(*hex) { High= Hexchartovalue (*hex); if(High <0){      *ch =' /'; return-3; } Hex++;//The pointer moves to the next characterLow = Hexchartovalue (*hex); if(Low <0){      *ch =' /'; return-3; } tmp= (High <<4) +Low ; *ch++ = (Char) tmp; Hex++; }  *ch =' /'; return 0;}intHexchartovalue (Const Charch) {  intresult =0; //get 16-binary high-byte bits of data  if(Ch >='0'&& CH <='9') {result= (int) (CH-'0'); }  Else if(Ch >='a'&& CH <='Z') {result= (int) (CH-'a') +Ten; }  Else if(Ch >='A'&& CH <='Z') {result= (int) (CH-'A') +Ten; }  Else{result= -1; }  returnresult;}CharValuetohexch (Const intvalue) {  Charresult =' /'; if(Value >=0&& value <=9) {result= (Char) (Value + -);//48 ASCII encoded ' 0 ' character encoded value  }  Else if(Value >=Ten&& value <= the) {result= (Char) (Value-Ten+ $);//subtract 10 to find its offset in 16, and 65 is the ASCII character encoding value of ' A '  }  Else{    ; }  returnresult;}

Conversion of strings and 16 binary strings