C Program For Octal to Decimal Conversion
The number system is one of the ways to represent numbers. Every number system has its own base or radix. For example, Binary, Octal, Decimal, and Hexadecimal Number systems are some of the number systems and are also used in microprocessor programming. These numbers are easy to convert from one system to another system. One can convert decimal to binary, decimal to hex, decimal to octal, and vice versa.
Example:
Input: octal number = 123
Output: decimal number = 83
Using Format Specifier
Below is the C program to convert octal to a decimal using a format specifier:
C
// C program to demonstrate conversion of // octal to decimal using format specifier #include <stdio.h> // Driver code int main() { int n; printf ( "Enter an Octal number: \n" ); scanf ( "%o" , &n); // printing the result printf ( "\nDecimal Representation is: %d" , n); return 0; } |
Output
Enter an Octal number: 123 Decimal Representation is: 83
Without using pow() function
Below is the C program to convert octal to decimal without using pow() function:
C
// C program to demonstrate conversion of // octal to decimal without using pow() #include <stdio.h> // Function to convert octal to decimal int octalToDecimal( int n) { int decimalvalue = 0; // Assigning base value to 1, i.e 8^0 int base = 1; int temp = n; // while loop executes the statements until the // condition is false while (temp) { // Finding the last digit int lastdigit = temp % 10; temp = temp / 10; // Multiplying last digit with appropriate // base value and adding it to decimalvalue decimalvalue += lastdigit * base; base = base * 8; } return decimalvalue; } // Driver code int main() { int octalnum = 123; printf ( "decimal number is %d" , octalToDecimal(octalnum)); } |
decimal number is 83
Using pow() Function
Below is the C program to convert octal to decimal using the pow() function:
C
// C program to demonstrate conversion of // octal to decimal using pow() #include <math.h> #include <stdio.h> int Octaltodecimal( int octal) { int decimalnumber = 0, i = 0; // while loop executes the statements // until the condition is false while (octal != 0) { // Calculating equivalent decimal number // for the given octal number decimalnumber = decimalnumber + (octal % 10) * pow (8, i++); octal = octal / 10; } // printing the result return decimalnumber; } // Driver code int main() { int octalnumber = 123; // calling function printf ( "decimal number is %d" , Octaltodecimal(octalnumber)); return 0; } |
decimal number is 83
Standard method(Without Using Functions)
Below is the C program to convert octal to decimals using the standard method:
C
// C program to demonstrate conversion of // octal to decimal without using functions #include <math.h> #include <stdio.h> // Driver code int main() { int octalnumber = 123, decimalnumber = 0; int i = 0; // while loop executes the statements // until the condition is false while (octalnumber != 0) { // Calculating equivalent decimal number // for the given octal number decimalnumber = decimalnumber + (octalnumber % 10) * pow (8, i++); octalnumber = octalnumber / 10; } // Printing the result printf ( "decimal number is: %d" , decimalnumber); return 0; } |
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