please help to check my program

[alice]

My program is to cal. the value of 10^9(output = 1,000,000,000)
is it correct after the line 'for'?

thk.

#include <math.h>
int aFunctionIterative(int a, int b) {
 
 int i, fact;

 for ( i=1; i<=b ;i++ )
 fact=pow(a,i);

 return fact;
 }

void main() {

 int result;
 result=aFunctionIterative(10,9);

 printf("%d",result);

 getchar();
}

[Salem]

> fact=pow(a,i);
You don't accumulate any answer, you may as well just do
fact=pow(a,b);
which just matches the last iteration of the loop

> void main()
Read the FAQ

> printf("%d",result);
You also need
#include <stdio.h>

[laserlight]

um, but doesnt pow(10, 9) give the answer?

So another way of doing it without pow() would be:

int aFunctionIterative(int a, int b) {
    int i, ret;
    ret = 1;
    for (i = 1; i <= b; i++)
        ret *= a;
    return ret;
}

int main(void) {
    int result;
    result = aFunctionIterative(10,9);
    printf("%d",result);

    getchar();
    return 0;
}

[lo_tek]

It worked in the Dev-C++ compiler, but may I make a few suggestions?

First off, it should be 'int main()', NOT 'void main()' .

Secondly, put 'return 0' at the end of the main function.

Thirdly, the getchar() is used to keep the screen up after the program runs, but if you are running windows, using 'system("PAUSE");' is a better method of keeping the screen up.

Fourthly, it is wise to have '#include <stdio.h>' for whenever you use the printf function.

[laserlight]

It shouldnt work as intended, lo_tek, and shouldnt compile in Dev-C++ since gcc wont accept void main(). Side note: I think Dev-C++ has a tendency to automatically include other standard libraries once one of them is used.

Using 'return 0;' to end main() isnt absolutely necessary nowadays, though should be good practice.
Also, on the getchar() thing, since it is more portable, why not use it?
After all, alice may not be a Windows user....

[Salem]

> Using 'return 0;' to end main() isnt absolutely necessary nowadays, though should be good practice.
Implicit return 0; from the end of main() is a C++ feature
I think C99 also does this, but there are not too many C99 compilers around and in common use