Typecasting in C | Typecasting Example in C Language | Typecasting Examples in C

Typecasting in C | Typecasting Example in C Language | Typecasting Examples in C




int main()
{
/* The (char) is a typecast, telling the computer to interpret the 65 as acharacter, not as a number. It is going to give the character output of the equivalent of the number 65 (It should be the letter A for ASCII). Note that the %c below is the format code for printing a single character
*/

printf( "%c\n", (char)65 );
getchar();
}




If you were paying careful attention, you might have noticed something kind of strange: when we passed the value of x to printf as a char, we'd already told the compiler that we intended the value to be treated as a character when we wrote the format string as %c. Since the char type is just a small integer, adding this typecast actually doesn't add any value!

So when would a typecast come in handy? One use of typecasts is to force the correct type of mathematical operation to take place. It turns out that in C (and other programming languages), the result of the division of integers is itself treated as an integer: for instance, 3/5 becomes 0! Why? Well, 3/5 is less than 1, and integer division ignores the remainder.

On the other hand, it turns out that division between floating point numbers, or even between one floating point number and an integer, is sufficient to keep the result as a floating point number. So if we were performing some kind of fancy division where we didn't want truncated values, we'd have to cast one of the variables to a floating point type. For instance, (float)3/5 comes out to .6, as you would expect!

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