﻿ C Program: Convert binary number to octal - w3resource

# C Exercises: Convert binary number to octal

## C For Loop: Exercise-53 with Solution

Write a C program to convert a binary number to octal.

Pictorial Presentation: Sample Solution:

C Code:

``````#include <stdio.h>
#include <math.h>

void main()
{       int n1, n,p=1;
int dec=0,i=1,j,d;
int ocno=0,dn;

printf("\n\nConvert Binary to Octal:\n ");
printf("-------------------------\n");

printf("Input a binary number :");
scanf("%d",&n);
n1=n;
for (j=n;j>0;j=j/10)
{
d = j % 10;
if(i==1)
p=p*1;
else
p=p*2;

dec=dec+(d*p);
i++;
}

/*--------------------------------------------*/
dn=dec;
i=1;

for(j=dec;j>0;j=j/8)
{
ocno=ocno+(j % 8)*i;
i=i*10;
n=n/8;
}

printf("\nThe Binary Number : %d\nThe equivalent Octal  Number : %d \n\n",n1,ocno);
}
```
```

Sample Output:

```Convert Binary to Octal:
-------------------------
Input a binary number :1001

The Binary Number : 1001
The equivalent Octal  Number : 11
```

Flowchart : C Programming Code Editor:

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## C Programming: Tips of the Day

Returning an array using C

You can't return arrays from functions in C. You also can't (shouldn't) do this:

```char *returnArray(char array []){
char returned ;
//methods to pull values from array, interpret them, and then create new array
return &(returned); //is this correct?
}
```

returned is created with automatic storage duration and references to it will become invalid once it leaves its declaring scope, i.e., when the function returns.

You will need to dynamically allocate the memory inside of the function or fill a preallocated buffer provided by the caller.

Dynamically allocate the memory inside of the function (caller responsible for deallocating ret)

```char *foo(int count) {
char *ret = malloc(count);
if(!ret)
return NULL;

for(int i = 0; i < count; ++i)
ret[i] = i;

return ret;
}
```

Call it like so:

```int main() {
char *p = foo(10);
if(p) {
// do stuff with p
free(p);
}

return 0;
}
```

Ref : https://bit.ly/3yFIeao

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