Question

How to convert decimal to octal in C

Answer 1

#include <stdio.h>

int main(void)
{
    long decimal = 253;
    int octal[8], i = 1;

    while(decimal != 0) {
        octal[i++] = decimal % 8;
        decimal = decimal / 8;
    }
    
    for (i = i - 1; i > 0; i--)
        printf("%d", octal[i]);

    return 0;
}

 
 
  
/*
run:
      
375
 
*/

 

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Answer 2

#include <stdio.h>

int decimalToOctal(int decimal) {
    int octal = 0, i = 1;

    while (decimal != 0) {
        octal += (decimal % 8) * i;
        decimal /= 8;
        i *= 10;
    }

    return octal;
}
 
int main(void)
{
    long decimal = 253;

    printf("%d", decimalToOctal(decimal));
 
    return 0;
}
 
  
  
   
/*
run:
       
375
  
*/

 

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