In C, how do you write a function that converts an integer to binary in a string?

The following C function converts an integer to binary and store the result in a string:

// Convert an integer to binary
// integer : the integer to convert
// binary : the string containing the conversion result
// n : number of bits (8, 16, 32 ...)
void int2bin(unsigned integer, char* binary, int n=8)
{  
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
}

Try it online on repl.it.

There is another, more user-friendly option which returns the string directly. But be careful, the memory needed for the string is allocated in the function, it is necessary to free it outside the function.

// Convert an integer to binary
// integer : the integer to convert
// n : number of bits (8, 16, 32 ...)
// Return a string containing the binary conversion
char* int2bin(unsigned integer, int n=8)
{
  char* binary = (char*)malloc(n+1);
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
  return binary;
}

Try it online on repl.it.

See also:

• In C, how to convert an integer to binary?
• In C, how to write a function that displays an integer in binary?
• In C, how do you write a function that converts an integer to binary (into another integer)?
• With Arduino, how to display an integer in binary ?

The following C function converts an integer to binary and store the result in a string:

// Convert an integer to binary
// integer : the integer to convert
// binary : the string containing the conversion result
// n : number of bits (8, 16, 32 ...)
void int2bin(unsigned integer, char* binary, int n=8)
{  
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
}

Try it online on repl.it.

There is another, more user-friendly option which returns the string directly. But be careful, the memory needed for the string is allocated in the function, it is necessary to free it outside the function.

// Convert an integer to binary
// integer : the integer to convert
// n : number of bits (8, 16, 32 ...)
// Return a string containing the binary conversion
char* int2bin(unsigned integer, int n=8)
{
  char* binary = (char*)malloc(n+1);
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
  return binary;
}

Try it online on repl.it.

See also:

• En C, comment convertir un entier en binaire ?
• In C, how to write a function that displays an integer in binary?
• In C, how do you write a function that converts an integer to binary (into another integer)?
• With Arduino, how to display an integer in binary ?

The following C function converts an integer to binary and store the result in a string:

// Convert an integer to binary
// integer : the integer to convert
// binary : the string containing the conversion result
// n : number of bits (8, 16, 32 ...)
void int2bin(unsigned integer, char* binary, int n=8)
{  
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
}

Try it online on repl.it.

There is another, more user-friendly option which returns the string directly. But be careful, the memory needed for the string is allocated in the function, it is necessary to free it outside the function.

// Convert an integer to binary
// integer : the integer to convert
// n : number of bits (8, 16, 32 ...)
// Return a string containing the binary conversion
char* int2bin(unsigned integer, int n=8)
{
  char* binary = (char*)malloc(n+1);
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
  return binary;
}

Try it online on repl.it.

Voire aussi :

• En C, comment convertir un entier en binaire ?
• In C, how to write a function that displays an integer in binary?
• In C, how do you write a function that converts an integer to binary (into another integer)?
• Avec l'environnement Arduino, comment afficher un entier en binaire ?

The following C function converts an integer to binary and store the result in a string:

// Convert an integer to binary
// integer : the integer to convert
// binary : the string containing the conversion result
// n : number of bits (8, 16, 32 ...)
void int2bin(unsigned integer, char* binary, int n=8)
{  
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
}

Try it online on repl.it.

There is another, more user-friendly option which returns the string directly. But be careful, the memory needed for the string is allocated in the function, it is necessary to free it outside the function.

// Convert an integer to binary
// integer : the integer to convert
// n : number of bits (8, 16, 32 ...)
// Return a string containing the binary conversion
char* int2bin(unsigned integer, int n=8)
{
  char* binary = (char*)malloc(n+1);
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
  return binary;
}

Try it online on repl.it.

Voire aussi :

• En C, comment convertir un entier en binaire ?
• En C, comment écrire une fonction qui affiche un entier en binaire ?
• En C, comment écrire une fonction qui convertit un entier en binaire (dans un autre entier) ?
• Avec l'environnement Arduino, comment afficher un entier en binaire ?

The following C function convert an integer to binary and store the result in a string:

// Convert an integer to binary
// integer : the integer to convert
// binary : the string containing the conversion result
// n : number of bits (8, 16, 32 ...)
void int2bin(unsigned integer, char* binary, int n=8)
{  
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
}

Try it online on repl.it.

There is another, more user-friendly option which returns the string directly. But be careful, the memory needed for the string is allocated in the function, it is necessary to free it outside the function.

// Convert an integer to binary
// integer : the integer to convert
// n : number of bits (8, 16, 32 ...)
// Return a string containing the binary conversion
char* int2bin(unsigned integer, int n=8)
{
  char* binary = (char*)malloc(n+1);
  for (int i=0;i<n;i++)   
    binary[i] = (integer & (int)1<<(n-i-1)) ? '1' : '0';
  binary[n]='\0';
  return binary;
}

Try it online on repl.it.

Voire aussi :

• En C, comment convertir un entier en binaire ?
• En C, comment écrire une fonction qui affiche un entier en binaire ?
• En C, comment écrire une fonction qui convertit un entier en binaire (dans un autre entier) ?
• Avec l'environnement Arduino, comment afficher un entier en binaire ?