What are the different types of keywords in C language?

Keywords are often called predefined or reserved words in programming languages. Each keyword in C language performs a specific function in the program.

• Keywords cannot be used as variable names.

• The keyword has a fixed meaning and this meaning cannot be changed.

• They are the building blocks of 'C' programs.

• C language supports 32 keywords.

• All keywords are written in lowercase letters.

The different types of keywords are as follows:

auto	double	int	struct
break	else	long	switch
case	enum	register	typedef
char	extern	return	union
const	short	float	unsigned
continue	for	signed	void
default	goto	sizeof	volatile
do	if	static	while

Example

The following is a C program for a simple calculator written using Switch Case:

Demonstration

#include <stdio.h>
int main(){
   char Operator;
   float num1, num2, result = 0;
   printf("</p><p> Try to Enter an Operator (+, -, *, /) : ");
   scanf("%c", &Operator);
   printf("</p><p> Enter the Values for two Operands: ");
   scanf("%f%f", &num1, &num2);
   switch(Operator){
      case &#39;+&#39;: result = num1 + num2;
      break;
      case &#39;-&#39;: result = num1 - num2;
      break;
      case &#39;*&#39;: result = num1 * num2;
      break;
      case &#39;/&#39;: result = num1 / num2;
      break;
      default: printf("</p><p> entered operator is invalid ");
   }
   printf("</p><p> The result of %.2f %c %.2f = %.2f", num1, Operator, num2, result);
   return 0;
}

Output

When the above program is executed, it produces the following result −

Enter an Operator (+, -, *, /) : *
Enter the Values for two Operands: 34 12
The result of 34.00 * 12.00 = 408.00

In the above example, the keywords used to execute the simple calculator program are as follows:

Int , char, switch, case, break, float, default, return

These words cannot be used as variables when writing a program.

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