CODEWITHSUNDEEP
c++visual-studiodebuggingwatch
ShrinivasD
ShrinivasD

Reputation: 63

How to modify value of variable automatically at runtime when hitting a breakpoint and continuing execution in VS?

We can change value manually by changing in variable tooltip or local/auto/watch window. But I want to change value of variable automatically to some specific hardcoded value or based on a code snippet. For eg.-

int main()
{
int a=0,b=1,c=2;
//bla bla
for(int i=0; i<100; ++i)
{
executeMe();
}
//bla bla
}

I want to put a breakpoint on line "executeMe()" and change value of 'b' to hardcoded value 3 or based on variable value 'c', so executing instruction 'b=c'. And continues execution without stopping everytime on breakpoint. How to do this in VS?

Upvotes: 0

Views: 104

Answers (2)

ShrinivasD
ShrinivasD

Reputation: 63

Use the 'Print a message:' option instead of a macro. Values from code can be printed by placing them inside {}. The key is that VS will also evaluate the content as an expression - so {variable_name=0} should achieve the same as the macro example.

Thanks to Tom McKeown for this solution on stackoverflow.com/a/15415763/2328412

Upvotes: 1

Weiwei
Weiwei

Reputation: 3776

You could use #if preprocessor directives, which is similar with below code.

        int a = 0, b = 1, c = 2;
        for (int i = 0; i < 100; ++i)
        {
#if DEBUG
            b=3;
#endif
            executeMe();
        }

Upvotes: 0

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