Code for Decimal To Binary Conversion Code: #include<stdio.h> void main() { int i,n1,t,w,a[100],i1=0; float n,f2; clrscr(); printf("[B]PROGRAM FOR DECIMAL TO BINARY CONVERSION[/B]\n"); printf("******************************************\n"); printf("\n\nENTER A NUMBER:"); scanf("%f",&n); w=n; f2=w; if(f2==n) { printf("");f2=0; } else { f2=n-f2; } n1=n; for(i=0;n1>=1;i++) { t=n1%2; n1=n1/2; i1++; a[i]=t; } printf("\n\nBINARY EQVALENT=>"); for(i=(i1-1);i>=0;i--) { printf("%d",a[i]); } printf("."); for(i=1;i<=6;i++) { f2=f2*2; if(f2>=1) { printf("1"); f2=f2-1; } else { printf("0"); } } getch(); }

We already have a similar program in the following article [thread=1548]Decimal, Hex, octal and binary number inter conversion[/thread]. The program is Decimal to binary.

hex to octal conversion Hi, I am new member of this site. I am not getting how to convert Hexadecimal number into octal no. AND vice-versa. Please give me code. Thanks. SUPRYA

Re: hex to octal conversion Supriya, Shabbir already provide a good article for number conversion.Go thru it for all type of number conversions. For your reference i make a slight touch to existing (Shabbir) program. To convert Hexadecimal no to octal no......(I just combined two functions into a single one) Coding listed below: //first convert Hex to Dec number //Next convert Dec to Oct number Code: #include<stdio.h> #include<string.h> #include<math.h> void main() { char hex[100]; double dec=0.0; int oct[100],temp[100]; int len,i,j,num=0; printf("Enter a hexadecimal number"); scanf("%s",hex); len=strlen(hex); for(i=0;i<len;i++) { switch(hex[i]) { case '0': temp[i]=hex[i]-48; //Ascii code of 0 is 48 48-48=0// break; case '1': temp[i]=hex[i]-48; //Ascii code of 1 is 49 49-48=1// break; case '2': temp[i]=hex[i]-48; //Ascii code of 2 is 50 50-48=2// break; case '3': temp[i]=hex[i]-48; //Ascii code of 3 is 51 51-48=3// break; case '4': temp[i]=hex[i]-48; //Ascii code of 4 is 52 52-48=4// break; case '5': temp[i]=hex[i]-48; //Ascii code of 5 is 53 53-48=5// break; case '6': temp[i]=hex[i]-48; //Ascii code of 6 is 54 54-48=6// break; case '7': temp[i]=hex[i]-48; //Ascii code of 7 is 55 55-48=7// break; case '8': temp[i]=hex[i]-48; //Ascii code of 8 is 56 56-48=8// break; case '9': temp[i]=hex[i]-48; //Ascii code of 9 is 57 57-48=9// break; case 'A': temp[i]=hex[i]-55; //Ascii code of A is 65 65-55=10// break; case 'B': temp[i]=hex[i]-55; //Ascii code of B is 65 66-55=11// break; case 'C': temp[i]=hex[i]-55; //Ascii code of C is 65 67-55=12// break; case 'D': temp[i]=hex[i]-55; //Ascii code of D is 65 68-55=13// break; case 'E': temp[i]=hex[i]-55; //Ascii code of E is 65 68-55=14// break; case 'F': temp[i]=hex[i]-55; //Ascii code of F is 65 69-55=15// break; } } for(i=0,j=len;i<len;i++,j--) dec=dec+(temp[j-1]*pow(16,i)); printf("The decimal equivalent is %lg \n",dec); num=(int)dec; //OCTAL CONVERSION for(i=0;num!=0;i++) { oct[i]=num%8; num=num/8; } i--; printf("\n Octal equivalent number:"); for(;i>=0;i--) printf("%d",oct[i]); printf("\n"); }

This article is about Number conversion and if you have some specific query create a new thread with proper title in the right forum.