convert_hex_into_binary.c

// C program to convert
// Hexadecimal number to Binary
 
#include <stdio.h>
 
// function to convert Hexadecimal to Binary Number
void HexToBin(char* hexdec)
{
 
    long int i = 0;
 
    while (hexdec[i]) {
 
        switch (hexdec[i]) {
        case '0':
            printf("0000");
            break;
        case '1':
            printf("0001");
            break;
        case '2':
            printf("0010");
            break;
        case '3':
            printf("0011");
            break;
        case '4':
            printf("0100");
            break;
        case '5':
            printf("0101");
            break;
        case '6':
            printf("0110");
            break;
        case '7':
            printf("0111");
            break;
        case '8':
            printf("1000");
            break;
        case '9':
            printf("1001");
            break;
        case 'A':
        case 'a':
            printf("1010");
            break;
        case 'B':
        case 'b':
            printf("1011");
            break;
        case 'C':
        case 'c':
            printf("1100");
            break;
        case 'D':
        case 'd':
            printf("1101");
            break;
        case 'E':
        case 'e':
            printf("1110");
            break;
        case 'F':
        case 'f':
            printf("1111");
            break;
        default:
            printf("\nInvalid hexadecimal digit %c",
                   hexdec[i]);
        }
        i++;
    }
}
 
// driver code
int main()
{
	char hexdec[100];
    printf("enter hexadecimal no\n");
	scanf("%s",hexdec);
 
    // Convert HexaDecimal to Binary
    printf("Equivalent Binary value is : ");
    HexToBin(hexdec);
	printf("\n");
}