Memory allocation. CSE 2451 Rong Shi. sizeof. The sizeof unary operator will return the number of bytes reserved for a variable or data type. Determine: Returning the byte length of a data type Number of bytes reserved for a structure (user defined type) Byte length of an array.
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/* How big is an int?
Most machines size ints as 4 bytes */
printf("%d \n", sizeof(int));
/* On most machines a struct with two ints is the same size as two ints:8 */
printf("%d \n", sizeof(TwoInts));
printf("%d \n", sizeof String);
printf("%d \n", sizeof(String));
/* As a unary operator and not a function, parenthesis are not necessary (if the argument is a variable), but aid readability */
int*ptr = (int*) malloc( sizeof (int) );
int*ptr = (int*) malloc( sizeof (*ptr) );