This document contains the source code for a program that converts numbers between different number systems. It takes in a number, base 1, and base 2 as input. It then converts the number from base 1 to decimal, and from decimal to base 2. Key aspects of the code include: 1. Validating the input number and bases are valid integers between 0-36. 2. Converting the input number from base 1 to decimal by iterating through each digit and raising the base to a power corresponding to the digit's position. 3. Converting the decimal number to base 2 by taking the modulus and dividing successive times by the new base, while adding the digits to a string in reverse order.

1. /*
SUBJECT: FUNDAMENTAL COMPUTER ORGANIZATION
COURSE : MCA-1
ROLL NO: 20
COLLAGE : ROLLWALA COMPUTER CENTER,GUJRATUNIVERSITY
NAME : PATEL SANDOIPBHAID.
EMAIL: PATELSANDIP445566@GMAIL.COM
ASSIGNMENT
PRACTICAL2
*/
// programfor CONVERTANYNUMBER SYSTEM TO ANY NUMBER SYSTEM
#include<stdio.h>
#include<conio.h>
intvalidInt(chars[]){
inti,n=0;
for(i=0;s[i]!='0';i++){
//checkno validornot
if(s[i]<'0'|| s[i]>'9')
return-1;
//forconvertnumbertointeger
n*=10;
n+=s[i]-48;

2. }
returnn;
}
voidmain(){
char s[50],r[50],sr[50];
inti,j,k,l;
intb1,b2,n,b,pn;
floatn1;//nis decimal n1is floating
intflag,ch,point;//flagforchecknoisvalidor not / flag1for check.(point)
do{
n1=0;point=0;
flag=1;i=j=k=0;
ch=1;
s[0]=r[0]=sr[0]='0';
printf("ntPROGRAMFORANYNUMBER SYSTEM TO ANY NYMBER SYSTEM CONVERTIONn");
printf("nYOUHAVETOGIVE BASE1 ANDBASE2 THE NUMBER OF BASE 1 IS CONVERTEDINTO
BASE 2");
do{
printf("nenterbase 1:");scanf("%s",&s);
b1=validInt(s);
if(b1<0){

3. printf("nnERROR:INVALIDBASETRY AGAIN:");
getch();
}
if(b1>36){
printf("nERROR:MAXIMUMBASE CAN BE 36 TRY AGAIN:");
getch();
continue;
}
}while(b1<0||b1>36);
do{
printf("nenterbase 2:");scanf("%s",&s);
b2=validInt(s);
if(b2<0){
printf("nnERROR:INVALIDBASETRY AGAIN:");
getch();
}
if(b2>36){
printf("nERROR:MAXIMUMBASE CAN BE 36 TRY AGAIN:");
getch();
continue;
}
}while(b2<0||b2>36);
if(b1==b2){

4. printf("nERROR:BOTHBASEARE SAME TRY AGAIN:");
getch();
continue;
}
printf("enternumber:");scanf("%s",&s);
//forconvertstrings to a numberof base1 systemandthenconvertit intodecimal
n=0;
b=b1;
//checksize of numberinstrings
for(i=0;s[i]!='0';i++);
j=i-1;
l=0;
/*
if pointfoundlike
12.25
program dolike
52.12
case 2:
123.25 = 52.123
//bothare wrong i actuallyneeded

5. 52.12 =12.25 and 123.25 =25.321
my programdo like that
52.12=21.52 and123.45=54.123
so i needto reverse the output
*/
point=0;
k=0;
for(i=j;i>=0;i--){
if(s[i]=='.'){
if(point<1){
point++;
r[l++]=s[i];
continue;
}
else{
printf("n**ERROR:INVALIDNUMBER MULTIPLE FLOATING
POINTS..**",b1);
flag=0;
break;
}
}
//dontreverse value of floatingpoint
if(point)
r[l++]=s[k++];
else

6. r[l++]=s[i];
}
if(!flag){
getch();
continue;
}
r[l]='0';
// printf("nstredvalueinr= %sn",r);
l--;
//reverse stringinrif it have a floatingvalue
if(point){
for(i=0;i<l;i++,l--){
point=r[i];//herepointisusedastemp
r[i]=r[l];
r[l]=point;
}
}
// printf("nreversedvalue inr= %sn",r);
/*
working
for e.g.1
sandip i l pointer
s p 0 5 s
pandis swaping

7. a i 1 4
pindas swaping
nd 2 3
pidnas swaping
d 3 3
eg.2
abc
a c 0 2
b 1 1
*/
l=1;
point=0;//requre fordistinguishfloatingnumberinfollowinglogicitbecomes1againif
numberisfloating
//checknumberisvalidornot for base 1
for(i=0;r[i]!='0';i++){
//checkfloatingvalue
if(r[i]=='.'){
l=1;
point++;
continue;
}
//whenbase lessthenorequal t10
if(b1<=10){

8. j=r[i]-48;
}
else{
if(r[i]>='A')
j=r[i]-55;
else
j=r[i]-48;
}
//if numbervalidthenconvertitintodecimal
if(j<b1&& ((r[i]>='0'&& r[i]<='9') || (r[i]>='A'&& r[i]<='Z')))
{
if(!point){
if(i==0)
n=j;
else
{
l*=b1;//thisisbase restopower
n+=l*j;//n is storingdesimal of anumber
}
}else{
l*=b1;//thisisbase restopower
n1+=(float)j/l;//nisstoringdesimal of anumber
}

9. }
else{
printf("n**ERROR:INVALIDNUMBER FORBASE %d..**",b1);
flag=0;
break;
}
}
if(!flag){
getch();
continue;
}
if(point){
n1+=n;
printf("ndecimal of (%s)%d =(%f)10",s,b1,n1);
n1-=n;
}else{
printf("ndecimal of (%s)%d =(%d)10",s,b1,n);
}
//convertion
//anyto decimal
//desimal toany

10. if(b2!=10){
k=n;
l=0;
while(k>0){
j=k%b2;
k/=b2;
if(j<10)
j+=48;
else{
j+=55;
}
r[l++]=j;
}
j=0;
for(i=l-1;i>=j;i--,j++){
k=r[i];
r[i]=r[j];
r[j]=k;
}
if(point){

11. r[l++]='.';
for(i=0;i<4;i++){
n1*=b2;
j=n1;
n1-=j;
if(j<10)
j+=48;
else{
j+=55;
}
r[l++]=j;
}
}
r[l]='0';
printf("n(%s)base %d= (%s) base %d",s,b1,r,b2);
}
printf("nnPRESSANYKEYTO CONTINUE:");
getch();
printf("nnENTER0 FOREXIT OR ANY NUMBER FORCONTINUE: ");scanf("%d",&ch);
}while(ch!=0);
}
/*

12. */