Thread: adding two binary numbers

hello guys~
I'm asked to make a program that will add two 32 bit binary numbers. I don't have any idea on what to do so please give me some tips and ideas.

This is what I've done so far and I still can't get the correct answer when I add two binary numbers. Please tell me what to do.

Code:

# include<stdio.h>
#include <string.h>
char x[32];
char y[32];
char z[32];
int a;
int carry=0;
main()
{
printf("Please input the first binary number.\n");
scanf("%s", x);
printf("Please input the second binary number.\n");
scanf("%s", y);
for(a=0;a<=31;a++){
if (x[a]=='0' && y[a]=='0' && carry==0){
z[a]='0';
carry=0;}
if (x[a]=='1' && y[a]=='0' && carry==0){
z[a]='1';
carry=0;}
if (x[a]=='0' && y[a]=='1' && carry==0){
z[a]='1';
carry=0;}
if (x[a]=='1' && y[a]=='1' && carry==0){
z[a]='0';
carry=1;}
if (x[a]=='1' && y[a]=='1' && carry==1){
z[a]='1';
carry=1;}
if (x[a]=='0' && y[a]=='0' && carry==1){
z[a]='1';
carry=0;}
if (x[a]=='0' && y[a]=='1' && carry==1){
z[a]='0';
carry=1;}
if (x[a]=='1' && y[a]=='0' && carry==1){
z[a]='0';
carry=1;}

}
printf("\nThe answer is ");
for(a=31;a>=0;a--)
printf("%c", z[a]);
}

Code:

num1 = strtol( firststring, NULL, 2 );
num2 = strtol( secondstring, NULL, 2 );
num3 = num1 + num2;

When in doubt, cheat using the standard library!


Quzah.

How are you storing the binary numbers in your program? Is it a user inputted value?

Sorry for the double post. My internet connection is not stable as of now.

This is what I've done so far and I still can't get the correct answer when I add two binary numbers. Please tell me what to do.

Code:

# include<stdio.h>
#include <string.h>
char x[32];
char y[32];
char z[32];
int a;
int carry=0;
main()
{
printf("Please input the first binary number.\n");
scanf("%s", x);
printf("Please input the second binary number.\n");
scanf("%s", y);
for(a=0;a<=31;a++){
if (x[a]=='0' && y[a]=='0' && carry==0){
z[a]='0';
carry=0;}
if (x[a]=='1' && y[a]=='0' && carry==0){
z[a]='1';
carry=0;}
if (x[a]=='0' && y[a]=='1' && carry==0){
z[a]='1';
carry=0;}
if (x[a]=='1' && y[a]=='1' && carry==0){
z[a]='0';
carry=1;}
if (x[a]=='1' && y[a]=='1' && carry==1){
z[a]='1';
carry=1;}
if (x[a]=='0' && y[a]=='0' && carry==1){
z[a]='1';
carry=0;}
if (x[a]=='0' && y[a]=='1' && carry==1){
z[a]='0';
carry=1;}
if (x[a]=='1' && y[a]=='0' && carry==1){
z[a]='0';
carry=1;}

}
printf("\nThe answer is ");
for(a=31;a>=0;a--)
printf("%c", z[a]);
}