Input an integer value in any format (decimal, octal or hexadecimal) using '%i' in C

Here, we are going to learn how to input an integer value in any format like decimal, octal or hexadecimal value using '%i' format specifier in C language?
Submitted by IncludeHelp, on September 13, 2018

We know that the decimal, octal, and hexadecimal value can be read through scanf() using "%d", "%o" and "%x" format specifier respectively.

  • "%d" is used to input decimal value
  • "%o" is used to input integer value in an octal format
  • "%x" is used to input integer value in hexadecimal format

But, there is the best way to read the integer value in any format from decimal, octal and hexadecimal - there is no need to use different format specifiers. We can use "%i" instead of using "%d", "%o" and "%x".

"%i" format specifier

It is used to read an integer value in decimal, octal or hexadecimal value.

  • To input value in decimal format - just write the value in the decimal format, example: 255
  • To input value in octal format - just write the value in octal format followed by "0", example: 03377
  • To input value in hexadecimal format – just write the value in hexadecimal format followed by "0x", example: 0xff


#include <stdio.h>

int main(void)
	int num;
	printf("Enter value: ");
	scanf("%i", &num);
	printf("num = %d\n", num);
	return 0;


Run1: Reading value in decimal format
Enter value: 255
num = 255

Run2: Reading value in octal format
Enter value: 0377
num = 255 

Run3: Reading value in hexadecimal format
Enter value: 0xFF
num = 255 

C scanf() Programs »



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