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https://cs50.stackexchange.com/questions/41924/error-use-of-undeclared-identifier-on-an-apparently-declared-variable …
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It is mentioned in the problem: American Express uses 15-digit numbers, MasterCard uses 16-digit numbers, and Visa uses 13- and 16-digit numbers. So with get_long, I perhaps need to restrict input …
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#include<stdio.h> #include<cs50.h> int main(void) { int h; do { h = get_int("h"); } while (h < 0 || h > 8); } In the above example, there is a reason to opt for do-while …
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Suppose I want a user to enter an integer between 1 and 8. To start with, here is the program that uses scanf to accept integer from user. #include <stdio.h> #include <cs50.h> int …
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