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Specifically, could you tell me what this line of code does:
int var1 = (var2 + 7) & ~7;
Thanks
307
Most likely the '?' is the ternary operator. Its grammar is: RESULT = (COND) ? ( STATEMEN IF TRUE) : (STATEMENT IF FALSE) It is a nice shorthand for the typical if-else statement: if (COND) { RESULT = (STATEMENT IF TRUE); } else { RESULT = (STATEMENT IF FALSE);
%d is a format specifier, used in C Language. Now a format specifier is indicated by a % (percentage symbol) before the letter describing it. In simple words, a format specifier tells us the type of data to store and print. Now, %d represents the signed decimal integer.
1 vote. The += operator performs enhanced assignments. The value of the expression to the right of the operator is added to the value of the variable to the left of the operator, and the result replaces the value of the variable. For example …
It's bitwise negation. This means that it performs the binary NOT operator on every bit of a number. For example:
int x = 15; // Binary: 00000000 00000000 00000000 00001111
int y = ~x; // Binary: 11111111 11111111 11111111 11110000
When coupled with the & operator it is used for clearing bits. So, in your example it means that the last 3 bits of the result of var2+7 are set to zeroes.
As noted in the comments, it's also used to denote destructors, but that's not the case in your example.
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