This C Program Converts the given Octal to Decimal. Octal is a numbering system that uses eight digits, 0 to 7, arranged in a series of columns to represent all numerical quantities. Each column or place value has a weighted value of 1, 8, 64, 512, and so on, ranging from right to left. Decimal is a term that describes the base-10 number system commonly used by lay people in the developed world.

Here is source code of the C program to Convert Octal to Decimal. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C Program to Convert Octal to Decimal`

`*/`

`#include <stdio.h>`

`#include <math.h>`

int main()

`{`

long int octal, decimal = 0;

int i = 0;

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);

return 0;

`}`

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Output: $ cc pgm3.c -lm $ a.out Enter any octal number: 67 Equivalent decimal value: 55

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