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Why does 2+2=5986? I saw this in the title of "practical C programming" by "Steve Oualline." Can anyone explain this?

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Seasoned Software Architect & Engineer with Over 5 Years of Diverse IT Industry Experience

I think your question is incomplete without the code. But still, I guess you may have used printf(“%d\n”); instead of printf("The answer is %d\n", answer); You have to use the variable answer as the second parameter of the printf. As the parameter is missing the printf-function prints...
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I think your question is incomplete without the code.

But still, I guess you may have used

printf(“%d\n”);

instead of 

printf("The answer is %d\n", answer);

You have to use the variable answer as the second parameter of the printf. As the parameter is missing the printf-function prints some random number, the current entry in the register used. 

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