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C Examples Number System Conversion

A number system is a way to represent numbers using a set of symbols. The most common systems are:

SystemBaseSymbols
Decimal100, 1, 2, 3, 4, 5, 6, 7, 8, 9
Binary20, 1
Octal80, 1, 2, 3, 4, 5, 6, 7
Hexadecimal160-9, A-F

Why Convert Number Systems?

  • Computers operate in binary, so decimal values often need conversion.
  • Octal and Hexadecimal are shorter representations of binary data.
  • Embedded systems, networking, and programming widely use number conversion.

Real-Time Applications

  1. Embedded Systems: Microcontrollers read data in binary, sometimes need octal or hexadecimal conversion.
  2. Networking: Systems convert IP addresses between decimal and binary.
  3. Computer Graphics: Designers often represent colors in hexadecimal (e.g., #FF5733).
  4. Digital Electronics: Engineers use binary, octal, and hexadecimal in logic circuits and memory addressing.
  5. Programming: Low-level programming and debugging often require conversions between decimal, hex, and binary.

Binary Number to Decimal and vice-versa

From Binary Number to Hexa-Decimal and vice-versa

Binary Number to Octal and vice-versa

  • Code will add soon

Octal Number to Decimal and vice-versa

  • Code will add soon

Convert Decimal to Binary Number vice-versa

Decimal to Hexa Decimal Number vice-versa

ASCII Value

C Program to Find ASCII Value of a Character

Code: 

#include <stdio.h>
int main()
{
    char c;
    printf("Enter a character: ");

    // Reads character input from the user
    scanf("%c", &c);

    // %d displays the integer value of a character
    // %c displays the actual character
    printf("ASCII value of %c = %d", c, c);
    return 0;
}

Output:

Enter a character: A
ASCII value of A = 65
--------------------------------
Process exited after 7.396 seconds with return value 0
Press any key to continue . . .

Explanation:

  • In this program, the user is asked to enter a character which is stored in variable c.
  • The ASCII value of that character is stored in variable c rather than that variable itself.
  • When %d the format string is used, 65 (ASCII value of ‘A’) is displayed.
  • When %c the format string is used, ‘A’ itself is displayed.

C Program to List out all ASCII Value

Code: 

#include <stdio.h>
void main()
{
	int i;
	
	for(i=0;i<=255;i++)
		printf("ASCII value of character %c: %d.\n",i,i);	
}

Output:

ASCII value of character  : 0.
ASCII value of character ☺: 1.
ASCII value of character ☻: 2.
ASCII value of character ♥: 3.
ASCII value of character ♦: 4.
ASCII value of character ♣: 5.
ASCII value of character ♠: 6.
ASCII value of character : 7.
ASCII value of character: 8.
ASCII value of character        : 9.
ASCII value of character
: 10.
ASCII value of character ♂: 11.
ASCII value of character ♀: 12.
: 13. value of character
ASCII value of character ♫: 14.
ASCII value of character ☼: 15.
ASCII value of character ►: 16.
ASCII value of character ◄: 17.
ASCII value of character ↕: 18.
ASCII value of character ‼: 19.
ASCII value of character ¶: 20.
ASCII value of character §: 21.
ASCII value of character ▬: 22.
ASCII value of character ↨: 23.
ASCII value of character ↑: 24.
ASCII value of character ↓: 25.
ASCII value of character →: 26.
ASCII value of character ←: 27.
ASCII value of character ∟: 28.
ASCII value of character ↔: 29.
ASCII value of character ▲: 30.
ASCII value of character ▼: 31.
ASCII value of character  : 32.
ASCII value of character !: 33.
ASCII value of character ": 34.
ASCII value of character #: 35.
ASCII value of character $: 36.
ASCII value of character %: 37.
ASCII value of character &: 38.
ASCII value of character ': 39.
ASCII value of character (: 40.
ASCII value of character ): 41.
ASCII value of character *: 42.
ASCII value of character +: 43.
ASCII value of character ,: 44.
ASCII value of character -: 45.
ASCII value of character .: 46.
ASCII value of character /: 47.
ASCII value of character 0: 48.
ASCII value of character 1: 49.
ASCII value of character 2: 50.
ASCII value of character 3: 51.
ASCII value of character 4: 52.
ASCII value of character 5: 53.
ASCII value of character 6: 54.
ASCII value of character 7: 55.
ASCII value of character 8: 56.
ASCII value of character 9: 57.
ASCII value of character :: 58.
ASCII value of character ;: 59.
ASCII value of character <: 60.
ASCII value of character =: 61.
ASCII value of character >: 62.
ASCII value of character ?: 63.
ASCII value of character @: 64.
ASCII value of character A: 65.
ASCII value of character B: 66.
ASCII value of character C: 67.
ASCII value of character D: 68.
ASCII value of character E: 69.
ASCII value of character F: 70.
ASCII value of character G: 71.
ASCII value of character H: 72.
ASCII value of character I: 73.
ASCII value of character J: 74.
ASCII value of character K: 75.
ASCII value of character L: 76.
ASCII value of character M: 77.
ASCII value of character N: 78.
ASCII value of character O: 79.
ASCII value of character P: 80.
ASCII value of character Q: 81.
ASCII value of character R: 82.
ASCII value of character S: 83.
ASCII value of character T: 84.
ASCII value of character U: 85.
ASCII value of character V: 86.
ASCII value of character W: 87.
ASCII value of character X: 88.
ASCII value of character Y: 89.
ASCII value of character Z: 90.
ASCII value of character [: 91.
ASCII value of character \: 92.
ASCII value of character ]: 93.
ASCII value of character ^: 94.
ASCII value of character _: 95.
ASCII value of character `: 96.
ASCII value of character a: 97.
ASCII value of character b: 98.
ASCII value of character c: 99.
ASCII value of character d: 100.
ASCII value of character e: 101.
ASCII value of character f: 102.
ASCII value of character g: 103.
ASCII value of character h: 104.
ASCII value of character i: 105.
ASCII value of character j: 106.
ASCII value of character k: 107.
ASCII value of character l: 108.
ASCII value of character m: 109.
ASCII value of character n: 110.
ASCII value of character o: 111.
ASCII value of character p: 112.
ASCII value of character q: 113.
ASCII value of character r: 114.
ASCII value of character s: 115.
ASCII value of character t: 116.
ASCII value of character u: 117.
ASCII value of character v: 118.
ASCII value of character w: 119.
ASCII value of character x: 120.
ASCII value of character y: 121.
ASCII value of character z: 122.
ASCII value of character {: 123.
ASCII value of character |: 124.
ASCII value of character }: 125.
ASCII value of character ~: 126.
ASCII value of character ⌂: 127.
ASCII value of character Ç: 128.
ASCII value of character ü: 129.
ASCII value of character é: 130.
ASCII value of character â: 131.
ASCII value of character ä: 132.
ASCII value of character à: 133.
ASCII value of character å: 134.
ASCII value of character ç: 135.
ASCII value of character ê: 136.
ASCII value of character ë: 137.
ASCII value of character è: 138.
ASCII value of character ï: 139.
ASCII value of character î: 140.
ASCII value of character ì: 141.
ASCII value of character Ä: 142.
ASCII value of character Å: 143.
ASCII value of character É: 144.
ASCII value of character æ: 145.
ASCII value of character Æ: 146.
ASCII value of character ô: 147.
ASCII value of character ö: 148.
ASCII value of character ò: 149.
ASCII value of character û: 150.
ASCII value of character ù: 151.
ASCII value of character ÿ: 152.
ASCII value of character Ö: 153.
ASCII value of character Ü: 154.
ASCII value of character ¢: 155.
ASCII value of character £: 156.
ASCII value of character ¥: 157.
ASCII value of character ₧: 158.
ASCII value of character ƒ: 159.
ASCII value of character á: 160.
ASCII value of character í: 161.
ASCII value of character ó: 162.
ASCII value of character ú: 163.
ASCII value of character ñ: 164.
ASCII value of character Ñ: 165.
ASCII value of character ª: 166.
ASCII value of character º: 167.
ASCII value of character ¿: 168.
ASCII value of character ⌐: 169.
ASCII value of character ¬: 170.
ASCII value of character ½: 171.
ASCII value of character ¼: 172.
ASCII value of character ¡: 173.
ASCII value of character «: 174.
ASCII value of character »: 175.
ASCII value of character ░: 176.
ASCII value of character ▒: 177.
ASCII value of character ▓: 178.
ASCII value of character │: 179.
ASCII value of character ┤: 180.
ASCII value of character ╡: 181.
ASCII value of character ╢: 182.
ASCII value of character ╖: 183.
ASCII value of character ╕: 184.
ASCII value of character ╣: 185.
ASCII value of character ║: 186.
ASCII value of character ╗: 187.
ASCII value of character ╝: 188.
ASCII value of character ╜: 189.
ASCII value of character ╛: 190.
ASCII value of character ┐: 191.
ASCII value of character └: 192.
ASCII value of character ┴: 193.
ASCII value of character ┬: 194.
ASCII value of character ├: 195.
ASCII value of character ─: 196.
ASCII value of character ┼: 197.
ASCII value of character ╞: 198.
ASCII value of character ╟: 199.
ASCII value of character ╚: 200.
ASCII value of character ╔: 201.
ASCII value of character ╩: 202.
ASCII value of character ╦: 203.
ASCII value of character ╠: 204.
ASCII value of character ═: 205.
ASCII value of character ╬: 206.
ASCII value of character ╧: 207.
ASCII value of character ╨: 208.
ASCII value of character ╤: 209.
ASCII value of character ╥: 210.
ASCII value of character ╙: 211.
ASCII value of character ╘: 212.
ASCII value of character ╒: 213.
ASCII value of character ╓: 214.
ASCII value of character ╫: 215.
ASCII value of character ╪: 216.
ASCII value of character ┘: 217.
ASCII value of character ┌: 218.
ASCII value of character █: 219.
ASCII value of character ▄: 220.
ASCII value of character ▌: 221.
ASCII value of character ▐: 222.
ASCII value of character ▀: 223.
ASCII value of character α: 224.
ASCII value of character ß: 225.
ASCII value of character Γ: 226.
ASCII value of character π: 227.
ASCII value of character Σ: 228.
ASCII value of character σ: 229.
ASCII value of character µ: 230.
ASCII value of character τ: 231.
ASCII value of character Φ: 232.
ASCII value of character Θ: 233.
ASCII value of character Ω: 234.
ASCII value of character δ: 235.
ASCII value of character ∞: 236.
ASCII value of character φ: 237.
ASCII value of character ε: 238.
ASCII value of character ∩: 239.
ASCII value of character ≡: 240.
ASCII value of character ±: 241.
ASCII value of character ≥: 242.
ASCII value of character ≤: 243.
ASCII value of character ⌠: 244.
ASCII value of character ⌡: 245.
ASCII value of character ÷: 246.
ASCII value of character ≈: 247.
ASCII value of character °: 248.
ASCII value of character ∙: 249.
ASCII value of character ·: 250.
ASCII value of character √: 251.
ASCII value of character ⁿ: 252.
ASCII value of character ²: 253.
ASCII value of character ■: 254.
ASCII value of character  : 255.

--------------------------------
Process exited after 1.219 seconds with return value 33
Press any key to continue . . .

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