C Programming and Technical

Q. What is the difference between %d and %*d in c language?

A. %d give the original value of the variable and %*d give the address of the variable.
eg:-int a=10,b=20;
printf("%d%d",a,b);
printf("%*d%*d",a,b);
Result is 10 20 1775 1775 .Here 1775 is the starting address of the memory allocation for the integer.a and b having same address because of contagious memory allocation

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C Other Question
Q. When should a type cast be used?

A. There are two situations in which to use a type cast. The first use is to change the type of an operand to an arithmetic operation so that the operation will be performed properly. The second case is to cast pointer types to and from void * in order to interface with functions
that expect or return void pointers. For example, the following line type casts the return value of the call to malloc() to be a pointer to a foo structure. struct foo *p = (struct foo *) malloc(sizeof(struct foo)); output?
Q. How does a C program come to know about command line arguments?

A. When we execute our C program, operating system loads the program into memory. In case of DOS, it first loads 256 bytes into memory, called program segment prefix. This contains file tables,environment segment, and command line information. When we compile the C program
the compiler inserts additional code that parses the command, assigning it to the argv array, making the arguments easily accessible within our C program