{"id":631,"date":"2024-10-10T10:52:06","date_gmt":"2024-10-10T05:22:06","guid":{"rendered":"https:\/\/codexplained.in\/?p=631"},"modified":"2025-11-24T16:01:29","modified_gmt":"2025-11-24T10:31:29","slug":"converting-decimal-to-hexadecimal","status":"publish","type":"post","link":"https:\/\/codexplained.in\/?p=631","title":{"rendered":"Converting Decimal to Hexadecimal."},"content":{"rendered":"
\n#include <stdio.h>\n\n\/\/ Function to convert decimal to hexadecimal\nvoid decimalToHexadecimal(int decimalNumber) {\n    int remainder;\n    char hexadecimal[100];  \/\/ Array to store hexadecimal digits\n    int index = 0;\n\n    \/\/ Loop to process the decimal number\n    while (decimalNumber != 0) {\n        remainder = decimalNumber % 16;  \/\/ Get the remainder of the division by 16\n\n        \/\/ Convert remainder to hexadecimal character\n        if (remainder < 10)\n            hexadecimal[index] = remainder + '0';  \/\/ For digits 0-9\n        else\n            hexadecimal[index] = remainder - 10 + 'A';  \/\/ For letters A-F\n\n        decimalNumber \/= 16;  \/\/ Divide the decimal number by 16 for the next digit\n        index++;  \/\/ Move to the next position\n    }\n\n    \/\/ Print the hexadecimal number in reverse order\n    printf("Hexadecimal equivalent: ");\n    for (int i = index - 1; i >= 0; i--) {\n        printf("%c", hexadecimal[i]);\n    }\n    printf("\\n");\n}\n\nint main() {\n    int decimalNumber;\n\n    \/\/ Input a decimal number from the user\n    printf("Enter a decimal number: ");\n    scanf("%d", &decimalNumber);\n\n    \/\/ Check if the input is zero\n    if (decimalNumber == 0) {\n        printf("Hexadecimal equivalent: 0\\n");\n    } else {\n        \/\/ Convert decimal to hexadecimal and display the result\n        decimalToHexadecimal(decimalNumber);\n    }\n\n    return 0;\n}\n\n<\/pre><\/div>\n\n\n
Explanation:<\/h2>\n\n\n\n
Input<\/strong>: The program asks the user to enter a decimal number <\/p>\n\n\n\n
.Conversion<\/strong>: It repeatedly divides the decimal number by 16, storing the remainders (which represent hexadecimal digits). If the remainder is between 0-9, it stays the same; if it’s between 10-15, it is converted to letters A-F .<\/p>\n\n\n\n
Result<\/strong>: The hexadecimal digits are stored in reverse order, so the program prints them in reverse to get the correct hexadecimal number.<\/p>\n\n\n\n
Special Case<\/strong>: If the input is 0<\/code>, the program directly outputs 0<\/code> in hexadecimal.<\/p>\n\n\n\n
Output:<\/h2>\n\n\n\n
    \n
  1.    Enter a decimal number: 255
       Hexadecimal equivalent: FF<\/li>\n<\/ol>\n\n\n\n
    <\/p>\n