pass by reference by inner function in C

I intend to change the value of count by function B(), but I failed...can't find the reason why...here's my code...

Code:

---

void B(int *count)
{
    do{
        *count = *count + 1;
    }while(condition);
}

void A(int *count)
{
    *count = 0;
    B(count);
}

int main()
{
    int count;
    A(&count);
    return 0;
}

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How do you know, you never check the value of count after you call A. What is condition?

Quote:

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Originally Posted by Subsonics

How do you know, you never check the value of count after you call A. What is condition?

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Well, the code I provided is a simplified version. I use printf() function to check in reality.

Quote:

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Originally Posted by shanwu

Well, the code I provided is a simplified version. I use printf() function to check in reality.

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Everything should be made as simple as possible but not simpler. :D

Your code does not make sense, what is "condition"? Is it ever updated? Where is it declared?

Quote:

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Originally Posted by shanwu

Well, the code I provided is a simplified version. I use printf() function to check in reality.

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This is a test program based on your code:

Code:

---

#include <stdio.h>

void B(int *count)
{
    *count = *count + 1;
}
 
void A(int *count)
{
    *count = 0;
    B(count);
}
 
int main(void)
{
    int count;
    A(&count);
    printf("%d\n", count);
    return 0;
}

---

I ran it and it prints 1. Therefore, contrary to your assertion in post #1, there is no problem with your code where changing the value of count in function B is concerned.

Quote:

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Originally Posted by laserlight

This is a test program based on your code:

Code:

---

#include <stdio.h>

void B(int *count)
{
    *count = *count + 1;
}
 
void A(int *count)
{
    *count = 0;
    B(count);
}
 
int main(void)
{
    int count;
    A(&count);
    printf("%d\n", count);
    return 0;
}

---

I ran it and it prints 1. Therefore, contrary to your assertion in post #1, there is no problem with your code where changing the value of count in function B is concerned.

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thank you very much. I will try to find other possible mistakes... thanks

Thus your problem is in 'condition' which you have left us guessing about so far.