complete this code and explain

there are 3 codes. they run but does not do what I want. first code is suppose to be a buffer overflow attack, 2nd Integer Overflow and finally format string attack . make the code to do the attack, show the vulnerability, explain the code and how to run it in difference word documents. Make it very simple, easy to read and understand but technical. No plagarism, some of this code are onlne and i have seen it and some of mine are from the online but I want a better explanation and I want it to work right Over all, tell me which Programming langauge is better to use to avoid all this attacks (pros and cons of all languages and these 3 attacks Thats it