Typecasting and type conversion in C programming language

in short, typecasting and type conversion  are designed to convert a variable from one datatype to other

Type conversion

in the first place, type conversion can be done by implicitly and it is used, if the two-variable have a different datatype

Implicit

to clarify, implicit conversion mean’s the data types are automatically adjusted by a compiler from the hierarchy of datatypes and The data types are adjusted from lower-level order to higher-level order of data types

If int a=2 and float b=2.5 then find a x b;

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a=2;
    float b=2.5;
        printf("c=%d",a*b);
    return 0;
}

Output

error : warning format '%d' expects argument of 'int' but argument 2 has type 'double'

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a=2;
    float b=2.5;
        printf("c=%f",a*b);
    return 0;
}

Output

5.000000

Typecasting

typecasting in contrast, achieved by explicitly. that is to say, forcefully conversion

in fact, the above problem of type conversion(automatic conversion by the compiler) can be avoided by using Typecasting

Syntax

(data type) expression;

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a=2;
    float b=2.5;
    int c = (int)a*b;
        printf("c=%d",c);
    return 0;
}

Output

c=5