Thread: Simulating an Adder

  1. #1
    Registered User
    Join Date
    Feb 2011

    Simulating an Adder

    I am having trouble with the "for loop" of a 32 bit Adder program. I am suppose to take 2 arrays of 32 bits and sum them together.

    The 2 errors I get are on line 37 and 38 called "called object is not in function".

    I don't know how to implement the for loop. Can anyone help or point me in the right direction?

    #include "stdio.h"
    #include "stdlib.h"
    int sum(int x[], int y[], int c);
    int carry(int d[], int e[], int f);
    int main (void){
        int a[31], b[31], sum[31];
        int x,y,c;
        int d,e,f;
        int i;
        printf("Enter 32 bits: ");
        scanf("%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d", 
        &a[31], &a[30], &a[29], &a[28], 
        &a[27], &a[26], &a[25], &a[24], &a[23], &a[22], &a[21], &a[20], &a[19], &a[18], &a[17], 
        &a[16], &a[15], &a[14], &a[13], &a[12], &a[11], &a[10], &a[9], &a[8], &a[7], 
        &a[6], &a[5], &a[4], &a[3], &a[2], &a[1], &a[0] );
        printf("Enter 32 bits: ");
        scanf("%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d", 
        &b[31], &b[30], &b[29], &b[28], 
        &b[27], &b[26], &b[25], &b[24], &b[23], &b[22], &b[21], &b[20], &b[19], &b[18], &b[17], 
        &b[16], &b[15], &b[14], &b[13], &b[12], &b[11], &b[10], &b[9], &b[8], &b[7], 
        &b[6], &b[5], &b[4], &b[3], &b[2], &b[1], &b[0] );
          int carryIn=0;   //Initialize 0 to carryIn
         sum(a[i],b[i],c); //compute the sum
         carry(a[i],b[i],carryIn); // compute the carryover
         sum[i] = sum(a[i],b[i],c);
         carryIn = carry(a[i],b[i],carryIn);
        return 0;
        int sums(int x[], int y[], int c){
            return ((!x && !y && c)||
                   (!x && y && !c) ||
                   (x && !y && !c) ||
                   (x && y && c));
        int carry(int d[], int e[], int f){
            return ((!d && e && f) || 
                    (d && !e && f) ||
                    (d && e && !f) ||
                    (d && e && f));

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    > int a[31], b[31], sum[31]
    You need [32] if you're going to store 32 numbers.

    > The 2 errors I get are on line 37 and 38 called "called object is not in function".
    You have a local array called 'sum' and a global function called 'sum'.
    Rename one of them.
    Though it would appear you later call your function 'sums'

    Oh, and neither of your functions should be taking array parameters, according to your usage.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    printf("Hello Cboard\n"); codeprada's Avatar
    Join Date
    Jan 2011
    In a little room at the back of your brain
    this was posted earlier and we said you should use scanf to read those integers

    int i = 0;
    for (; i < 32; i++) 
        scanf("%d", &a[i]);
    We shouldn't be quick to criticize unless we can do better.
    public function __clone() { die ( "I'm one of a kind" ); }

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