Codeblocks assigned a value to a variable on its own

Question

So I have declared an integer called toplam in c but did not give it a value at all. However when I opened the watches window it is shown that it has a value of 16. I used an online c compiler and copy and pasted the code into it and it ran smoothly without assigning any value to toplam unless asked. I think this is an error in Codeblocks itself but i am not sure. how do I fix this without having to subtract 16 from toplam in order for it to be 0?

int fak(int j){
    int sonuc=1;
    while(j!=0){
        sonuc = sonuc * j;
        j--;
    }

    return sonuc;
}


int main()
{
    int sayi,i,j,sonuc,toplam;
    printf("sayi giriniz: \n");
    scanf("%d",&sayi);

    for(i=1;;i*=10){
        if(sayi/i==0){
            break;
        }
        j=(sayi/i)%10;
        printf("%d\n",j);
        toplam=toplam+fak(j);
    }

    printf("%d",toplam);


    return 0;
}

this is my code. It takes the inputed number and prints out the individual numbers in it and then adds their faktorials together.

As explained in the first answer to this question: https://stackoverflow.com/questions/21152138/local-variable-initialized-to-zero-in-c local variables that are not explicitely initialized have an indeterminate value, including potentially a "trap representation" that would lead to undefined behavior. If you want `toplam` to be `0`, initialize it to `0`. — Virgile, Dec 02 '20 at 12:59
What value do you expect to see if you do not initialize? During its lifetime a variable always has a value. It cannot have no value. — Gerhardh, Dec 02 '20 at 13:59
@Virgile yes thank you very much, I am new to coding and I didn't know that was a thing :) — cdKm.90, Dec 02 '20 at 15:40

score 0 · Accepted Answer · answered Dec 02 '20 at 13:52

You just initialize toplam at 0

#include <stdio.h>

int fak(int j)
{
    int sonuc=1;
    while(j!=0)
    {
         sonuc = sonuc * j;
         j--;
    }
     return sonuc;
 }

int main()
{
    int sayi,i,j,sonuc,toplam=0;
    printf("sayi giriniz: ");
    scanf("%d",&sayi);
   for(i=1;i<=(i*10);i++)
   {
       if(sayi/i==0)
       {
           break;
       }
       j=(sayi/i)%10;
       printf("%d \n",j,fak(j));
       toplam=toplam+fak(j);
    }
    printf("%d",toplam);
    return 0;
}

Codeblocks assigned a value to a variable on its own

1 Answers1