What’s difference between char s and char *s in C?
Consider below two statements in C. What is the difference between the two?
char s = "geeksquiz"; char *s = "geeksquiz";
Below are the key differences:
The statements ‘char s = “geeksquiz”‘ creates a character array which is like any other array and we can do all array operations. The only special thing about this array is, although we have initialized it with 9 elements, its size is 10 (Compiler automatically adds ‘\0’)
The statement ‘char *s = “geeksquiz”‘ creates a string literal. The string literal is stored in the read-only part of memory by most of the compilers. The C and C++ standards say that string literals have static storage duration, any attempt at modifying them gives undefined behavior.
s is just a pointer and like any other pointer stores address of string literal.
Running above program may generate a warning also “warning: deprecated conversion from string constant to ‘char*’”. This warning occurs because s is not a const pointer, but stores address of the read-only location. The warning can be avoided by the pointer to const.
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