#include <stdio.h>

#include<conio.h>

#include <math.h>

int main()

{

long int octal, decimal = 0;

int i = 0;

clrscr();

printf(“Enter any octal number: “);

scanf(“%ld”, &octal);

while (octal != 0)

{

decimal = decimal +(octal % 10)* pow(8, i++);

octal = octal / 10;

}

printf(“Equivalent decimal value: %ld”,decimal);

getch();

return(0);

}

Output :-

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