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c++ error C4700: uninitialized local variable 'num1' used

Started by indelvarn Dec 14, 2012 at 7:45 AM 1 replies 3.7k views

Original Post

Dec 14, 2012 at 7:45 AM

can anyone tell me what's the problem here?

c++ error C4700: uninitialized local variable 'num1' used

#include "stdafx.h"
#include
int main()
{
int num1 = 1;
int num2 = 2;
while (num1 < 101)
{
printf("%d\n",num1);
printf("%d\n",num2);
int num1 = num1 + num2;
int num2 = num1 + 1 + num2;
}
}

kunos

Dec 14, 2012 at 7:51 AM

you declare and initialise num1 at the beginning. Then on this line:

int num1 = num1 + num2;

You are redeclaring another "num1" that is "shadowing" (hiding) the first one you've declared. At this point the compiler sees the "num1" in the expression as the one you've just declared.

You don't need to declared a new num1, you just need to assign it, so, to fix:

num1=num1+num2;

Or, more to the point:

num1+=num2;

Make sure you read and understand (google for it) variable declaration, scoping and assignment.

indelvarn

Dec 14, 2012 at 12:54 PM

you declare and initialise num1 at the beginning. Then on this line:

int num1 = num1 + num2;

You are redeclaring another "num1" that is "shadowing" (hiding) the first one you've declared. At this point the compiler sees the "num1" in the expression as the one you've just declared.

You don't need to declared a new num1, you just need to assign it, so, to fix:

num1=num1+num2;

Or, more to the point:

num1+=num2;

Make sure you read and understand (google for it) variable declaration, scoping and assignment.

thanks!

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