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Comprehensive Collection of C Programming Examples
In this example, you will learn how to convert between octal and decimal numbers by creating user-defined functions.
To understand this example, you should be familiar with the followingC ProgrammingTopic:
#include <stdio.h>
#include <math.h>
int convertDecimalToOctal(int decimalNumber);
int main()
{
int decimalNumber;
printf("Enter decimal number: ");
scanf("%d", &decimalNumber);
printf("%d(decimal) = %d(octal)", decimalNumber, convertDecimalToOctal(decimalNumber));
return 0;
}
int convertDecimalToOctal(int decimalNumber)
{
int octalNumber = 0, i = 1;
while(decimalNumber != 0)
{
octalNumber += (decimalNumber % 8) * ;
decimalNumber /= 8;
i *= 10;
}
return octalNumber;
}Output Result
Enter decimal number: 116 116(decimal) = 164(octal)
#include <stdio.h>
#include <math.h>
long long convertOctalToDecimal(int octalNumber);
int main()
{
int octalNumber;
printf("Enter octal number: ");
scanf("%d", &octalNumber);
printf("%d(octal) = %lld(decimal)", octalNumber, convertOctalToDecimal(octalNumber));
return 0;
}
long long convertOctalToDecimal(int octalNumber)
{
int decimalNumber = 0, i = 0;
while(octalNumber != 0)
{
decimalNumber += (octalNumber%10) * pow(8,i);
++;
octalNumber/=10;
}
i = 1;
return decimalNumber;
}Output Result
Enter an octal number: 164 164(Octal) =116(Decimal)