Errors are the problems or the faults that occur in the program, which makes the behavior of the program abnormal, and experienced developers can also make these faults. Programming errors are also known as the bugs or faults, and the process of removing these bugs is known as debugging.

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These errors are detected either during the time of compilation or execution. Thus, the errors must be removed from the program for the successful execution of the program.

There are mainly five types of errors exist in C programming:

Syntax errorRun-time errorLinker errorLogical errorSemantic error

Syntax error

Syntax errors are also known as the compilation errors as they occurred at the compilation time, or we can say that the syntax errors are thrown by the compilers. These errors are mainly occurred due to the mistakes while typing or do not follow the syntax of the specified programming language. These mistakes are generally made by beginners only because they are new to the language. These errors can be easily debugged or corrected.

For example:

If we want to declare the variable of type integer,int a; // this is the correct formInt a; // this is an incorrect form.

Commonly occurred syntax errors are:

If we miss the parenthesis (}) while writing the code.Displaying the value of a variable without its declaration.If we miss the semicolon (;) at the end of the statement.

Let"s understand through an example.

#include int main(){ a = 10; printf("The value of a is : %d", a); return 0;}



In the above output, we observe that the code throws the error that "a" is undeclared. This error is nothing but the syntax error only.

There can be another possibility in which the syntax error can exist, i.e., if we make mistakes in the basic construct. Let"s understand this scenario through an example.

#include int main(){ int a=2; if(.) // syntax error printf("a is greater than 1"); return 0;}

In the above code, we put the (.) instead of condition in "if", so this generates the syntax error as shown in the below screenshot.



Run-time error

Sometimes the errors exist during the execution-time even after the successful compilation known as run-time errors. When the program is running, and it is not able to perform the operation is the main cause of the run-time error. The division by zero is the common example of the run-time error. These errors are very difficult to find, as the compiler does not point to these errors.

Let"s understand through an example.

#include int main(){ int a=2; int b=2/0; printf("The value of b is : %d", b); return 0;}



In the above output, we observe that the code shows the run-time error, i.e., division by zero.

Linker error

Linker errors are mainly generated when the executable file of the program is not created. This can be happened either due to the wrong function prototyping or usage of the wrong header file. For example, the main.c file contains the sub() function whose declaration and definition is done in some other file such as func.c. During the compilation, the compiler finds the sub() function in func.c file, so it generates two object files, i.e., main.o and func.o. At the execution time, if the definition of sub() function is not found in the func.o file, then the linker error will be thrown. The most common linker error that occurs is that we use Main() instead of main().

Let"s understand through a simple example.

#include int Main(){ int a=78; printf("The value of a is : %d", a); return 0;}



Logical error

The logical error is an error that leads to an undesired output. These errors produce the incorrect output, but they are error-free, known as logical errors. These types of mistakes are mainly done by beginners. The occurrence of these errors mainly depends upon the logical thinking of the developer. If the programmers sound logically good, then there will be fewer chances of these errors.

Let"s understand through an example.

#include int main(){ int sum=0; // variable initialization int k=1; for(int i=1;i



In the above code, we are trying to print the sum of 10 digits, but we got the wrong output as we put the semicolon (;) after the for loop, so the inner statements of the for loop will not execute. This produces the wrong output.

Semantic error

Semantic errors are the errors that occurred when the statements are not understandable by the compiler.

The following can be the cases for the semantic error:

Use of a un-initialized i;i=i+2;Type compatibilityint b = "";Errors in expressionsint a, b, c;a+b = c;Array index out of boundint a<10>;a<10> = 34;

Let"s understand through an example.

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#include int main(){int a,b,c;a=2;b=3;c=1;a+b=c; // semantic errorreturn 0;}

In the above code, we use the statement a+b =c, which is incorrect as we cannot use the two operands on the left-side.