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Edit: for my class I have to use scanf . So recommending other ways of input is not the solution I am looking for (if there is one that involves scanf). If I am reading in user input for a small project (for example, a game). Lets say I ask would you like to play? This would accept a yes or no answer. So i write up some simple code like this: #include <stdio.h> int main(void) { char string[3]; //The max number of letters for "yes". printf("Would you like to play?"); scanf("%s", string); } So this code should simply ask them to input yes or no . I am setting the length of my char array to size 3 . This way it is large enough to hold yes and also no . But if someone were to enter invalid input such as yesss , I know how to compare the string afterwards to handle such an event, but wouldn't this technically/possibly overwrite other local variables I have declared because it would extend outside the length of my array? If so, is there a way to handle this to restrict 3 input characters or something? And if not, why/how does it know to only input for the size of 3?

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