What are implicit type conversions and explicit type conversions in C language?

Converting one data type to another is called type conversion.

• Implicit type conversion
• Explicit type conversion
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Implicit type conversion

• When operating When numbers have different data types, the compiler provides implicit type conversion.

• It is done automatically by the compiler by converting smaller data types to larger data types.

int i,x;
float f;
double d;
long int l;



Here, the above expression finally evaluates to a "double" value.

Example

The following is an example of implicit type conversion -

int x;
for(x=97; x<=122; x++){
   printf("%c", x); /*Implicit casting from int to char %c*/
}

Explicit type conversion

• Explicit type conversion by User completion using the (type) operator.

• Before performing the conversion, a runtime check is made to see if the target type can hold the source value.

int a,c;
float b;
c = (int) a + b

Here, the result of 'a b' is explicitly converted to 'int' and then assigned to 'c'.

Example

The following is an example conversion of explicit type-

int x;
for(x=97; x<=122; x++){
   printf("%c", (char)x); /*Explicit casting from int to char*/
}

Let us understand the difference between two type conversions through an example-

Example (Implicit conversion)

Real-time demonstration

#include<stdio.h>
main(){
   int i=40;
   float a;
   //Implicit conversion
   a=i;
   printf("implicit value:%f</p><p>",a);
}

Output

Implicit value:40.000000

Example (explicit conversion)

Real-time demonstration

#include<stdio.h>
main(){
   int i=40;
   short a;
   //Explicit conversion
   a=(short)i;
   printf("explicit value:%d</p><p>",a);
}

Output

Explicit value:40

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