C programming struggling on the part with y/n and saving the file... please incl

Question

C programming

struggling on the part with y/n and saving the file... please include comments thank you

ConvertDec to Hex-Oct-Bin.c ConvertDec_to_Hex-0ct-Bin.c is a simple conversion program that prompts the user for an integer from 1 to 1,000,000, and displays this integer value in hexadecimal, octal, and binary representation. The user is then asked if the output should be saved to a text file. If user replies in the affirmative, a name for the text file is requested. If the requested text file cannot be created, user is re-prompted for a different file name. The text file will contain user's name, current date, and output results (see example below). User Interface: Enter an Integer (1 - 1000000) or type x to exit: 240 Decimal: 240 Hexadecimal: FO Octal: 360 Binary: 11110000 Save to a file? (y/n): y Enter file name: cs222 hw3.txt File saved Enter an Integer (1- 1000000) or type x to exit: x Good bye

Explanation / Answer

#include <iostream>

#include<stdio.h>

#include<string.h>

char* reversestring(char *a)

{

int i,l;

char *r;

l=strlen(a);

r=(char*)malloc(l*sizeof(char));

for(i=0;i<l;i++)

r[i]=*(a+l-i-1);

r[i]='';

return r;

}

char*DecToHex(int dec)

{

char hex[10];

int i=0,tnum,rem;

tnum=dec;

while(tnum!=0)

{

rem=tnum%16;

hex[i++]=rem<=9?'0'+rem:'A'+rem-10;

tnum/=16;

}

hex[i]='';

return(reversestring(hex));

}

int DecToOct(int dec)

{

int oct=0;

int i=1,tnum,rem;

tnum=dec;

while(tnum!=0)

{

rem=tnum%8;

oct=i*rem+oct;

tnum/=8;

i=i*10;

}

return(oct);

}

int DecToBin(int dec)

{

int bin=0;

int i=1,tnum,rem;

tnum=dec;

while(tnum!=0)

{

rem=tnum%2;

bin=i*rem+bin;

tnum/=2;

i*=10;

}

return(bin);

}

int BinToDec(int bin)

{

int rem,dec=0,base=1;

int num;

num=bin;

while(num>0)

   {

rem = num % 10;

dec = dec + rem * base;

num = num / 10 ;

base = base * 2;

}

return dec;

}

int HexToDec(char* hex)

{

int dec=0,base=1,i,d;

char c;

i=strlen(hex)-1;

while(i>=0)

{

c=*(hex+i);

if(c>='A'&&c<='F')

d=10+c-'A';

else if(c>='a'&&c<='f')

d=10+c-'a';

else

d=c-'0';

dec+=d*base;

base*=16;

i--;

}

return dec;

}

int OctToDec(int oct)

{

int dec=0,base=1;

int t;

t=oct;

while(t>0)

{

dec+=(t%10)*base;

t/=10;

base*=8;

}

return dec;

}

void int main()

{

int inputnum,from,to,fromto,out;

char inputs[10];

char *outs;

printf(" Choose the number system to convert from. ");

printf("From: 1.Decimal 2.Binary 3.Octal 4.Hexadecimal ");

scanf("%d", &from);

printf(" enter the number. ");

if(from<4)

scanf("%d",&inputnum);

else

scanf("%s",inputs);

printf("Choose the number system to convert to. ");

printf("To: 1.Decimal 2.Binary 3.Octal 4.Hexadecimal ");

scanf("%d", &to);

fromto=from*10+to;

switch(fromto)

{

case 12:out=DecToBin(inputnum);break;

case 13:out=DecToOct(inputnum);break;

case 14:outs=DecToHex(inputnum);break;

case 21:out=BinToDec(inputnum);break;

case 23:out=DecToOct(BinToDec(inputnum));break;

case 24:outs=DecToHex(BinToDec(inputnum));break;

case 31:out=OctToDec(inputnum);break;

case 32:out=DecToBin(OctToDec(inputnum));break;

case 34:outs=DecToHex(OctToDec(inputnum));break;

case 41:out=HexToDec(inputs);break;

case 42:out=DecToBin(HexToDec(inputs));break;

case 43:out=DecToOct(HexToDec(inputs));break;

}

if(to==4)

printf(" %s",outs);

else

printf(" %d",out);

}

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