C Program to Convert the given Binary Number into Decimal

#include < stdio.h>
 
void main()
{
    int  num, binary_val, decimal_val = 0, base = 1, rem;
 
    printf("Enter a binary number(1s and 0s) \n");
    scanf("%d", &num); /* maximum five digits */
    binary_val = num;
    while (num > 0)
    {
        rem = num % 10;
        decimal_val = decimal_val + rem * base;
        num = num / 10 ;
        base = base * 2;
    }
    printf("The Binary number is = %d \n", binary_val);
    printf("Its decimal equivalent is = %d \n", decimal_val);
}

Output

 Enter a binary number ( 1s and 0s ) 
 10101001 
The Binary number is =  10101001 
Its decimal equivalent is = 169S

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