Contains 9 units, which includes an AP Exam Prep unit.

Curriculum length: A minimum of 140 class hours should be taught as a full-year course.

Audience: High school students, grades 9 - 12.

Another option is to use fgets to accept limited input.AP® Computer Science A invites students to learn programming using Java and can be taken after completing an introductory course such as Computer Science Principles or Computer Science Discoveries. I believe there is a way for scanf to limit the amount of input accepted, but will need to look up how. Note, you can still overflow your string buffer if you enter (in this case) more >= 64 characters, and you'll be back where you started. Scanf('%s', string) // string decays to a pointer to where its memory is allocated. one for the NUL terminator, which scanf will addĬhar reversed = 'Placeholder' // This reserves at least 12 bytes, 11 for the text plus the NUL terminator. Instead, try something like this: int main()Ĭhar string = '' // string can now hold 63 user-input characters plus In this case, they're one in the same, but if that was a pointer to heap memory, for instance, &string would not point to the memory you've reserved. You must provide it a pointer to the memory where the input should go, you're providing the address of the pointer.

You're not allocating any memory for string, so when the user inputs something, its written into memory it doesn't own, resulting in undefined behavior.

I just set up Visual Studio so it is possible I missed something and this is an easy fix but not quite sure what it is. It will say 'Done!' and that's all that ever happens (I have to force stop because I never see the place to input the string therefore the program just keeps running waiting for an input). All it says is that the program is running. When I run this program, the first printf statement is never printed nor is the user input ever shownĪnywhere (not in the terminal either).

Printf('The string reversed is %s', reversed) Printf('Your original string is %s ', string) Printf('Please enter an input string. ') I have everything set up already and have started writing up code as well but I seem to be running into a problem where I cannot see the user input. I'm attempting to learn C and decided to use Visual Studio as a base for where I can practice my code.

Learn c++ visual studio code