In Java it is acceptable, but in C it is not.
Redefining y causes an error because it has already been defined.
Output:
$ cc pgm2.c
pgm2.
c: In function ‘main’:
pgm2.
c:5: error: redefinition of ‘y’
pgm2.
c:4: note: previous definition of ‘y’ was here
The "stdio.h" header file has a predefined function called scanf(). Input and output operations are performed by printf and scanf() in C. The header file stdio.h contains these function statements.
If a variable is declared but not defined, it is not a mistake. Extern declarations, for instance.
A const type value cannot be altered.
Output:
$ cc pgm1.c
pgm1.c: In function ‘foo’:
pgm1.c:13: error: assignment of read-only location ‘*i’
The sub-expression "x = foo()" in the C programming language will give the variable "x" a value of 2. The result will be 1 as a result of the subsequent check to see whether this value is not equal to 1.
In a C program, the keyword constant is const.
The variable x is given a value of zero in the C code above. We are giving x a new value of zero in the if condition. Keep in mind that we are "NOT" comparing the values to zero (you can see that there is only one "=" symbol, not two "==" signs). As a result, the else condition's printf() function is called, causing "Its not zero" to be shown and the if condition to become false.
An error occurs because only underscore and no other special characters are permitted in variable names.
In a C program, the keyword constant is const.
A variable name cannot contain a space, comma, or the symbol $.
A float cannot be converted to a pointer type.
The father of the C programming language is Dennis Ritchie. At the United States' American Telephone & Telegraph Bell Laboratories, the C programming language was created in 1972.
The # sign is used to specify C-preprocessors.
The preprocessor feature known as conditional compilation allows for the creation of various executables.
It cannot begin with a digit, per the convention for C variable names.
