Senthil

String can hold only char data. Where as an array can hold any data type. An array size can not be changed. Where as a string size can be changed if it is a char pointer An Array is collection of elements of similar type which are referred by a common name. Each element is accessed by its value. First element has index 0 and last element has index which is 1 less than the size of array. The length of the string is the number of characters + one (null character'\0'). Declaration of Array:- data_type array_name[size]; String is collection of characters. So it is called character array. Each string is terminated by null character('')

The ANSI C standard provides a predefined symbol named __STDC__ that is set to 1 when the compiler is enforcing strict ANSI standard conformance. If you want your programs to be 100 percent ANSI conformant, you should ensure that the __STDC__ symbol is defined. If the program is being compiled with non-ANSI options, the __STDC__ symbol is undefined. The following code segment shows how this symbol can be checked: #ifdef __STDC__ printf("Congratulations! You are conforming perfectly to the ANSI standards!\n"); #else printf("Shame on you, you nonconformist anti-ANSI rabble-rousing programmer!\n"); #endif

The __DATE__ macro is used to insert the current compilation date in the form "mm dd yyyy" into your program. Similarly, the __TIME__ macro is used to insert the current compilation time in the form "hh:mm:ss" into your program. This date-and-time-stamp feature should not be confused with the current system date and time. Rather, these two macros enable you to keep track of the date and time your program was last compiled. This feature can come in very handy when you are trying to track different versions of your program. For instance, many programmers like to put a function in their programs that gives compilation information as to when the current module was compiled. This task can be performed as shown here: #include stdio.h void main(void); void print_version_info(void); void main(void) { print_version_info(); } void print_version_info(void) { printf("Date Compiled: %s\n", __DATE__); printf("Time Compiled: %s\n", __TIME__); }