句法:
- 它指的是用诸如C / C++之类的编程语言编写任何语句的规则和规定。
- 它与语句的含义无关。
- 如果一条语句遵循所有规则,则在语法上是有效的。
- 它与语言的语法和结构有关。
语义:
- 它指的是与编程语言中的语句关联的含义。
- 语句的含义全在于它可以轻松地解释程序。
- 错误在运行时处理。
程序1:
下面是演示语义错误的代码:
C++
// C++ program to demonstrate semantic error
#include
using namespace std;
// Driver Code
int main()
{
// Return statement before cout
return 0;
// Print the value
cout << "GFG!";
}
Java
// Java program to demonstrate semantic error
import java.util.*;
class GFG
{
// Driver Code
public static void main(String[] args)
{
// exit() statement before cout
System.exit(0);
// Print the value
System.out.print("GFG!");
}
}
// This code is contributed by aashish1995
Python3
# Python program to demonstrate semantic error
import sys
# Driver Code
if __name__ == '__main__':
# exit() statement before cout
sys.exit(0);
# Prthe value
print("GFG!");
# This code contributed by gauravrajput1
C#
// C# program to demonstrate semantic error
using System;
class GFG
{
// Driver Code
public static void Main(String[] args)
{
// exit() statement before cout
Environment.Exit(0);
// Print the value
Console.Write("GFG!");
}
}
// This code is contributed by gauravrajput1
C++
// C++ program to demonstrate basic operation
// without any syntax and semantic error
#include
using namespace std;
// Driver Code
int main()
{
// To print gfg
cout << "GFG!";
return 0;
}
Java
// Java program to demonstrate basic operation
// without any syntax and semantic error
class GFG{
// Driver Code
public static void main(String[] args)
{
// To print gfg
System.out.print("GFG!");
}
}
// This code is contributed by aashish1995
Python3
# Python3 program to demonstrate basic operation
# without any syntax and semantic error
# To print gfg
print("GFG!")
# This code is contributed by divyeshrabadiya07.
C#
// C# program to demonstrate basic operation
// without any syntax and semantic error
using System;
public class GFG
{
// Driver Code
public static void Main(String[] args)
{
// To print gfg
Console.Write("GFG!");
}
}
// This code contributed by Rajput-Ji
输出:
解释:
- 由于上述程序在语义上不正确,因此输出将为空白。
- 该程序没有语法错误,因为它遵循所有编程规则,但仍不会在屏幕上打印任何内容,因为return语句写在cout语句之前,这导致程序在打印屏幕上的任何内容之前终止。这种情况被认为是语义错误。
程式2:
下面是正确的代码,即没有任何语法和语义错误。
C++
// C++ program to demonstrate basic operation
// without any syntax and semantic error
#include
using namespace std;
// Driver Code
int main()
{
// To print gfg
cout << "GFG!";
return 0;
}
Java
// Java program to demonstrate basic operation
// without any syntax and semantic error
class GFG{
// Driver Code
public static void main(String[] args)
{
// To print gfg
System.out.print("GFG!");
}
}
// This code is contributed by aashish1995
Python3
# Python3 program to demonstrate basic operation
# without any syntax and semantic error
# To print gfg
print("GFG!")
# This code is contributed by divyeshrabadiya07.
C#
// C# program to demonstrate basic operation
// without any syntax and semantic error
using System;
public class GFG
{
// Driver Code
public static void Main(String[] args)
{
// To print gfg
Console.Write("GFG!");
}
}
// This code contributed by Rajput-Ji
输出:
GFG!
语法和语义错误之间的表格差异:
Basis |
Syntax |
Semantics |
---|---|---|
Meaning | It refers to the rules of any statement in the programming language. | It refers to the meaning associated with any statement in the programming language |
Error | It referred to as syntax error. It is generally encountered at the compile time. It occurs when a statement that is not valid according to the grammar of the programming language. Some examples are: missing semicolons in C++, using undeclared variables in Java, etc. | It referred to as semantic error. It is generally encountered at run time. It occurs when a statement is syntactically valid but does not do what the programmer intended. This type of error is tough to catch. |
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