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Basic Data Types

  • In C each variable must have a type
  • C has the following generic data types:

    char   character   'A', 'e', '#', …
    int   integer   2, 17, -5, …
    float   floating-point number   3.14159, …
    double   double precision floating-point   3.14159265358979, …

  • Variable declaration must specify a data type and a name; they can be initialised when they are declared: 

    float x;
char  ch = 'A';
int   j = i;

  • Value of a variable can be converted into a different type in expressions: 

    int   m = 3, n = 4;
float x;

//   Type conversion
x = (float)m / (float)n;
// now, x = 0.75