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# Program for Number Conversion from Decimal to Binary, Decimal to Octal, Decimal to Hexa, Binary to Octal, Binary to Hexa, Octal to Hexa

Posted By: Archie Evans     Category: C Programming     Views: 29905

## Code for Program for Number Conversion from Decimal to Binary, Decimal to Octal, Decimal to Hexa, Binary to Octal, Binary to Hexa, Octal to Hexa in C Programming

```#include<stdio.h>
#include<conio.h>
#include<math.h>
int D2B(int);
int D2O(int);
int D2H(int);
int B2O(int);
int B2H(int);
int O2H(int);
int B2D(int);
int O2D(int);
main()
{
int ch,num;
clrscr();
printf("\n1.Decimal 2 Binary.");
printf("\n2.Decimal 2 Octal.");
printf("\n3.Decimal 2 Hexa.");
printf("\n4.Binary 2 Octal.");
printf("\n5.Binary 2 Hexa.");
printf("\n6.Octal 2 Hexa.");
printf("\n7.Exit.");
scanf("%d",&ch);
switch(ch)
{
case 1:
clrscr();
printf("\nEnter any Decimal number:");
if(scanf("%d",&num)!=0 && num>0)
D2B(num);  //calling functionelse
printf("\nNot Allowed!!");
break;
case 2:
clrscr();
printf("\nEnter any Decimal number:");
if(scanf("%d",&num)!=0 && num>0)
D2O(num);  //calling functionelse
printf("\nNot Allowed!!");
break;
case 3:
clrscr();
printf("\nEnter any Decimal number:");
if(scanf("%d",&num)!=0 && num>0)
D2H(num);  //calling functionelse
printf("\nNot Allowed!!");
break;
case 4:
clrscr();
printf("\nEnter any binary number:");
if(scanf("%d",&num)!=0)// && (num==0 || num==1))
B2O(B2D(num));  //calling functionelse
printf("\nNot Allowed!!");
break;
case 5:
clrscr();
printf("\nEnter any binary number:");
if(scanf("%d",&num)!=0)// && (num==0 || num==1))
B2H(B2D(num));  //calling functionelse
printf("\nNot Allowed!!");
break;
case 6:
clrscr();
printf("\nEnter any Octal number:");
if(scanf("%d",&num)!=0)
D2H(O2D(num));  //calling functionelse
printf("\nNot Allowed!!");
break;
case 7:
exit(0);
default:
printf("\nEnter proper Choice:");
break;

}
getch();
}

int D2B(int dec) //decimal to binary
{
int bin=0,*bin_arr,count=0;
while(dec>0)
{
bin=dec%2;
dec/=2;
*(bin_arr+count)=bin;
count++;
}
printf("\nBINARY=");
while(count > 0)
{
--count;
printf("%d",*(bin_arr+count));
}
return 0;
}

int D2O(int dec) //decimal to octal
{
int oct=0,*oct_arr,count=0;
while(dec>0)
{
oct=dec%8;
dec/=8;
*(oct_arr+count)=oct;
count++;
}
printf("\nOCTAL=");
while(count > 0)
{
--count;
printf("%d",*(oct_arr+count));
}
return 0;
}

int D2H(int dec) //decimal to hexa
{
int hexa=0,*hexa_arr,count=0;
while(dec>0)
{
hexa=dec%16;
dec/=16;
*(hexa_arr+count)=hexa;
count++;
}
printf("\nHEXA=");
while(count > 0)
{
--count;
switch(*(hexa_arr+count))
{
case 10:
printf("A");
break;
case 11:
printf("B");
break;
case 12:
printf("C");
break;
case 13:
printf("D");
break;
case 14:
printf("E");break;
case 15:
printf("F");break;
default:
printf("%d",*(hexa_arr+count));
break;
}
}
return 0;
}

int B2D(int bin) //binary to decimal
{
int *bin_arr,count=0,dec=0,mod,idx=0;
while(bin!=0)
{
mod=bin%10;
bin/=10;
*(bin_arr+count)=mod;
count++;
}
while(count>0)
{
--count;
bin=*(bin_arr+idx);
dec+=bin * (int)(pow(2,idx));
idx++;
}
return dec;
}

int B2O(int dec)
{
int oct=0,*oct_arr,count=0;
while(dec>0)
{
oct=dec%8;
dec/=8;
*(oct_arr+count)=oct;
count++;
}
printf("\nOCTAL=");
while(count > 0)
{
--count;
printf("%d",*(oct_arr+count));
}
return 0;
}
int B2H(int dec)
{
int hexa=0,*hexa_arr,count=0;
while(dec>0)
{
hexa=dec%16;
dec/=16;
*(hexa_arr+count)=hexa;
count++;
}
printf("\nHEXA=");
while(count > 0)
{
--count;
switch(*(hexa_arr+count))
{
case 10:
printf("A");
break;
case 11:
printf("B");
break;
case 12:
printf("C");
break;
case 13:
printf("D");
break;
case 14:
printf("E");break;
case 15:
printf("F");break;
default:
printf("%d",*(hexa_arr+count));
break;
}
}
return 0;
}

int O2D(int oct)
{
int *dec_arr,count=0,dec=0,mod,idx=0;
while(oct!=0)
{
mod=oct%10;
oct/=10;
*(dec_arr+count)=mod;
count++;
}
while(count>0)
{
--count;
oct=*(dec_arr+idx);
dec+=oct * (int)(pow(8,idx));
idx++;
}
return dec;

}```
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 Archie Evans author of Program for Number Conversion from Decimal to Binary, Decimal to Octal, Decimal to Hexa, Binary to Octal, Binary to Hexa, Octal to Hexa is from London, United Kingdom. View All Articles