Thread: Need help.

44 in hex 0x2C
88 in hex 0x58
188978561112 in hex 0x2C00000058

So what I got from this is that I gotta move the first number 32 bits to the left so <<32 and then add the second number and yea that works.

Code:

int main()
{
    signed int a;
    signed int b;
    unsigned long long  c;
    scanf("%i \n %i",&a, &b);
    c = (((unsigned long)a <<32)+b);
    printf("First number %d \nSecond number %d\n",a,b);
    printf("%llu \n",c);
        
}

But Im not sure what to do if the second number is negative.

I cant get the correct number there is an one more example.

e.g. First number 20, Second number -33 result 90194313183

in hex thats 0x14, -0x21 reslut 0x14FFFFFFDF

Did but I still dont get the correct result for 20 -33
18446744073709551583

Originally Posted by JohnnyC

Did but I still dont get the correct result for 20 -33
18446744073709551583

Is that the result you want or the result you're getting?

Thats the result I'm getting when I put 20 and -33 using | instead of +.
If I use + I get 85899345887.

While I should be getting 90194313183

Well, 20 is 0x14 and -33 is (at least on my machine) 0xffffffdf, and 90194313183 is 0x14ffffffdf, so that seems like a reasonable choice.

Presumably what's happening is that your -33 is getting promoted to long, and therefore the top 32 bits are getting filled with ones instead of zeroes because of the sign bit; to make that not happen you should mask off the top thirty-two bits of b.

Long lost father?

But yea it works Thanks a lot

Code:

int main()
{
    signed int a;
    signed int b;
    scanf("%i \n %i",&a, &b);
    unsigned long long c = 0;
    c = c | (unsigned int)a;
    printf("Deci%lld\n",c);
    printf("Hex%llx\n\n",c);
    c = c << 32;
    printf("Deci%lld\n",c);
    printf("Hex%llx\n\n",c);
    c = c | (unsigned int)b;
    printf("Deci%lld\n",c);
    printf("Hex%llx\n\n",c);
    
    printf("First number %d \nSecond number %d\n",a,b);
    printf("%lld \n",c);
    
        int (add_special_type) = (a+b);
        {
            printf("%lld\n",(long long)add_special_type);        
        }    
}

Some of the printf I put just to see whats it doing so I can better understand it.
And the int add_special_type, that was also in the assignment so yea.
Thank you guys

Without the printf

Code:

int main()
{
    signed int a;
    signed int b;
    scanf("%i \n %i",&a, &b);
    
    unsigned long long c = 0;
    c = c | (unsigned int)a;
    c = c << 32;
    c = c | (unsigned int)b;

    printf("First number %d \nSecond number %d\n",a,b);
    printf("%lld \n",c);
    
        int (add_special_type) = (a+b);
        {
            printf("%lld\n",(long long)add_special_type);        
        }    
}