Binary and decimal system of C language

Binary is a number system widely used in computing technology . Binary data is used 0 and 1 A number represented by two numbers . But in real life , People use the decimal system , It may be related to the fact that humans have ten fingers . So how to realize the conversion between binary and decimal ？

problem ：
Input 4 Contains only 0 and 1 The integer of （ Binary number ）, Print the decimal equivalent .

Programming requirements ：
1、 According to the requirements of the topic, realize the hexadecimal conversion , With the help of printf Function output result ;
2、 Use scanf Function to input data ;
3、 Please output strictly according to the output effect ;（ Affect the performance evaluation ）
4、 When submitting the code of the task, it is necessary to ensure that it conforms to the industry code specification , You need to indent and wrap as necessary .（ Affect the performance evaluation ）

Running effect ：
Please enter only 4 The binary number of bits ：1101
The corresponding decimal number is ：13
Please press any key to continue . . .

#include <stdio.h>

int main(void)
{
    
    int number, result, a, b, c, d;
    printf(" Please enter only 4 The binary number of bits ：");
    scanf("%d", &number);
    a = number / 1000 ;
    b = number / 100 % 10;
    c = number / 10 % 10;
    d = number % 10;
    printf(" The corresponding decimal number is ：%d\n", a * 8 + b * 4 + c * 2 + d);

    return 0;
}