Difference between Compile Time and Run Time

 Compile Time : 

It is a Time window During which a Program is Compiled. During Compilation , a source code or program is converted into machine code.

There are two types of errors in Compile Time known as Compile Time errors :

• Syntax Error
• Semantic Error

Syntax Error : 

The Error occurs due to mistake in syntax or predefined way of writting a programm during compilation is called Syntax Error.

Example : 

#include<iostream>

using namespace std;

int main()

{

    int a = 10:        // Every statement should be ended with an ' ; ' (semicolon) , but here it is ended with 

                            // ' : ' (colon) it is an syntax error.

    int b = 20;

    return 0;

}

Semantic Error : 

The wrong and meaningless code/statement in a programm are called Semantic Errors.

Example : 

int main()

{

    int a, b, c;

    a + b = c;        // It is a meaningless statement because the operations done on right side of the code

                            // must be stored in one and only single variable present in the left side.

    return 0;

}

Run Time : 

It is a time window during which a Compiled program is executed or in a process of execution. Here is no Role of Compiler because the program is already compiled and is in running process.

Run Time Error : 

During Run Time the Error occurs is detected by the User itself only. 

Example : 

#include<iostream>

using namespace std;

int main()

{

    int a = 10 , b = 0 , div;

    div = a / b;

    return 0;

}

"Note : The number divisible by 0 is undefined so here occures a run time error"