# Answer to Question #26587 in C++ for deepak jha

Question #26587

write a c++ program to convert decimal to binary

Expert's answer

/* write a c++ program to convert decimal to binary */

#include <iostream>

using namespace std;

// converts integer n to the binary

// and saves binary string to the variable b voiddec2bin(unsigned int n, char * b) {

int i,j,a;

char x;

a=n;

i=0;

do

{

b[i++]='0'+ (a%2); // compute the remainder of division of a by 2

a/=2; // divide a by 2 (integer division)

}

while(a>0);

// now bcontains binary digits of n but in reversed form,

// forinstance: if n=10, then b="0101", so we should reverse b

i--;

// reverse thearray b

// if thelenght of b is 7, then we exchange

// b[0] <=> b[6],

// b[1] <=> b[5],

// b[2] <=> b[4]

for(j=0;j<=i/2; j++)

{

x = b[j];

b[j] =b[i-j];

b[i-j] = x;

}

// set lastbyte in b to zero, so b is a C-string

b[++i]=0;

}

int main()

{

unsigned int n;

char b[200];

// ask to enternumber till the user enter 99999

do

{

cout<< "n = ";

cin>> n;

dec2bin(n,b);

cout<< n << " => " << b << endl;

}

while(n!=99999);

return 0;

}

#include <iostream>

using namespace std;

// converts integer n to the binary

// and saves binary string to the variable b voiddec2bin(unsigned int n, char * b) {

int i,j,a;

char x;

a=n;

i=0;

do

{

b[i++]='0'+ (a%2); // compute the remainder of division of a by 2

a/=2; // divide a by 2 (integer division)

}

while(a>0);

// now bcontains binary digits of n but in reversed form,

// forinstance: if n=10, then b="0101", so we should reverse b

i--;

// reverse thearray b

// if thelenght of b is 7, then we exchange

// b[0] <=> b[6],

// b[1] <=> b[5],

// b[2] <=> b[4]

for(j=0;j<=i/2; j++)

{

x = b[j];

b[j] =b[i-j];

b[i-j] = x;

}

// set lastbyte in b to zero, so b is a C-string

b[++i]=0;

}

int main()

{

unsigned int n;

char b[200];

// ask to enternumber till the user enter 99999

do

{

cout<< "n = ";

cin>> n;

dec2bin(n,b);

cout<< n << " => " << b << endl;

}

while(n!=99999);

return 0;

}

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