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you have a small typo error in the function you have written: int get_positive_int versus: int get_positive_int_

I don't think you have understood how a DO-WHILE loop works. The difference with other loops is that THIS is going to be executed at least once, regardless of the condition we impose. With this we get …

I assume you're referring to the format specifiers of printf function, these are the same as those of the standard version of C, but if you're mean the cs50.c library uses its own data types in order to …

We have a small syntax error the binary operator "greater than or equal to" is written >= And no =>

encrypted character, the following works: if (alphabets_upper[index] == s[i]) { int cipher = alphabets_upper[(index + key) % 26]; printf("%c" … , cipher); } if (alphabets_lower[index] == s[i]) { int cipher = alphabets_lower[(index + key) % 26]; printf("%c" …

If you use the IDE, the easiest way is to use the make command, if not, you must use the -lcs50 option when compiling to avoid the error indicated

In effect it is not an ascii value for an alphabetical character, if, however, it is not what we are trying to do, but what we want is to substitute the m character for the corresponding one of the ke …

"The values returned are nonzero if the character c falls into the tested class, and a zero value if not." We can use that to build the if condition, the correct way would be: if (! …

i<= strlen(keyword) keep in mind that keyword begins with the zero subscript so that if its length is given by strlen the one index is strlen(keyword) - 1, the correct statement would be: i < strle …

< stdio > is an instruction that tells the compiler to include that file when compiling and to search for that file in the default directory, usually / usr / include, if we use the quotes the compiler …

Just a couple of things, you are assigning an operation between variables of type float to a variable of type int. When this is done the result is truncated, it is not rounded, hence the results you g …

The division between two integers in C differs from the rest of modern languages, here we are left with the integer part of the quotient and we eliminate the decimal part (k becomes integer and loses its …

The most important thing is that both forms are correct, the way to write it is just a question of preferences, write it in the way that is most clear to you, that if, you must be consistent with the …

What is supposed to be * card? We can not apply own operators of a pointer to a variable of integer type in this case. It seems that the compiler is interpreting this as an indirect operation of a poi …

To evaluate the right side first we must put the parentheses on the right side of the identity, not the operator == itself if (counterCardLength == 15 && FindFirstTwoDigits == (34 | 37)) if (a == (1 …