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What is the difference between printf and putchar() or scanf and getchar() ?

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Top Forums Programming What is the difference between printf and putchar() or scanf and getchar() ?
# 8  
Old 12-05-2012
Quote:
Originally Posted by kris26
Corona, so i hav check out tis ASCII character set, yea i found tat 1st 16 character of ASCII character r non printable control characters. I wonder if 0 = 0, 1 = 1, 2 =2 and so forth, and '0' = 48, why will it bcome 1 when we minus '1' - '0' and not a non printable control characters?
It would be non-printable control characters if you dumped it into the terminal raw. That's why you use printf("%d", num) to print it and don't dump it into the terminal raw.

But, they're all just numbers. What do they mean, is the question.

Read it raw from a terminal? It's going to be ASCII. Convert as appropriate.

You got int i=10; ? It's already a binary integer.
Last edited by Corona688; 12-05-2012 at 01:23 AM..
This User Gave Thanks to Corona688 For This Post:
kris26
# 9  
Old 12-05-2012
Oh okay thanks, so how is the character set look like in bit pattern? We noe tat numeric value of 48 is stored as 01100000. How about '0' which hav a value of 48?
And where can i get tis ASCII character set list?
Last edited by kris26; 12-05-2012 at 10:37 AM..
# 10  
Old 12-05-2012
The binary value for an ASCII '0' looks like 01100000.

The binary value for a numeric 48 looks like 01100000.

You might notice a certain resemblance between the two... They're all just numbers. The question is, what do they mean.

You can get a list of the ASCII character set at the wikipedia page for ascii.
This User Gave Thanks to Corona688 For This Post:
kris26
# 11  
Old 12-06-2012
Okay, i got it. How do u read the ASCII table?
# 12  
Old 12-06-2012
Look for 48 in the 'dec' column, you'll find the character 0 there. The nonprinting characters are in a separate section above the printing section, in it you'll find many characters which aren't used in text these days(binary is another matter) as well as familiar things like tab, backspace, newline, and carriage return.

Here is a more abbreviated table which just lumps everything together.
This User Gave Thanks to Corona688 For This Post:
kris26
# 13  
Old 12-06-2012
Haha, okay. I juz realized tat the chart in wikipedia is arranged in Hexadecimal form.
# 14  
Old 12-07-2012
Quote:
Originally Posted by kris26
Haha, okay. I juz realized tat the chart in wikipedia is arranged in Hexadecimal form.
Smilie Wikipedia lists four different number bases in their chart, not just hex. It's just the same number represented four different ways.

Check the 'dec' column. You will see the arrangement is still the same.
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