How do you make binary to decimal converter in G W BASIC?

First of all we will talk about how binary number are converted back into decimal representation and later we will have program.

Here is the formula of this transformation:

Binary number: a3a2a1a0

Decimal number a x 23 + a x 22 + a x 21 + a x 20

Example:

Binary: 1101

Decimal: 1 x 23 + 1 x 22 + 0 x 21 + 1 x 20 = 8 + 4 + 0 + 1 = 13

And here we have our program:

#include

#include

#include

int main() {

char str[100];

int ind;

int sum = 0;

printf("Please enter binary number: ");

scanf("%s", str);

for(ind = 0; ind < strlen(str); ind++) {

sum += (str[ind] - 0x30) * pow(2, strlen(str) - ind - 1);

}

printf("Number in decimal would be %d\n", sum);

return 0;

}

Testing:

Please enter binary number: 1101

Number in decimal would be 13

Please enter binary number: 10000001

Number in decimal would be 129

Please enter binary number: 11111111

Number in decimal would be 255

Please enter binary number: 0

Number in decimal would be 0